Is there a good light for growing plants?

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the best light for plants is sun light , put your plants on the window stil or plant outside
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How does light help plants to grow?

Light is an essential component in photosynthesis,light is absorbed by chlorophyll in leaves & is used to make food(glucose) through the process of photosynthesis,therefore helping them to grow & thrive. Yes, water and sunlight is needed for plants to photosynthesise and therefore grow. Photosynthesis is the process in which the plant creates chemicals and "food" through the sunlight hitting the chlorophyll in the leaves. Water and CO2 levels are just as important though!

Why do plants grow toward the light?

Plants grow naturally towards the strongest source of light, this is called phototropism . They do this in order to maximise their exposure to the sun and increase the amount of photosysnthesis (and therefore growth). This is a survival mechansim. An example of this is plants close to a window will always grow towards the window (for more light); most people simply turn the plant around to balance the "lobsided" growth effect that it creates.

Do plants grow with sun light or with out?

Answer . Most plants grow by using light to produce food via photosynthesis, however some plants, such as fungi are able to produce food without the use of sunlight.

How do you grow a good bean plant?

Answer . Churn up the soil in the spring. Add lots of compost and fertilizer (Osmocote, or miracle gro) and re-till the soil. Plant them in an area that receives at least 6 hours of sunlight a day. Plant the seeds or small plants in the spring when danger of frost is past. Erect a 'Beanstalk' from lattice, sticks, or caging wire. Water them every other day that it doesn't rain, or when the soil looks dry.

Does light effect how a plant grows?

Yes. The more sunlight it gets, the higher it grows. Light provides the energy required for photosysnthesis to occur

Do plants need light to grow?

All plants need sun light to grow except for the few living on the ocean floor which lives off of material harmful to most living things. ( I am only about 90% positive about this)

Will a plant grow in artificial light?

Growing plants with artificial light is very popular. Growingplants with artificial light is particularly useful when naturallight is not abundant.

Can a plant grow in artificial light?

Plants are grown in artificial light all the time. As long as the photons of light are of the correct wavelength the plant does not care where the light comes from.

How does a plant grow towards the light?

When a plant only gets light on one side, it produces a hormonecalled auxin to make the part of the plant in the shade to growlonger. This causes the plant to bend and go more towards thelight.

Can plants grow from artificial light?

It depends if the artificial light gives off enough heat. You'd specifically need a heat lamp.

Will plants grow with fluorescent lights?

Fluorescent light works for most of plants and even aquarium fish. But when it comes to special races of plants, such as mariguana or some philotherms, HPS or MH can achieve a better effect. Check the link below for more detail about fluorescent light.

Can plants grow with indirect light?

It depends on the plant, some plants can only grow in indirect light as direct light can burn the leaves. An example of this is the African Violet which should be grown in indirect light. There are some plants, however, that require full sun and others that require shade. It depends on the genetic make-up of the plant.

Where can you find grow lights for plants?

Grow lights are usually purchased from a local specialty store that can be found in the yellow pages listed under either INDOOR GARDENING or HYDROPNICS. The internet is also a good resource for both grow lights and indoor gardening supplies. Common internet search terms are grow lights, indoor gardening and hydroponics.

Can you grow plants in artificial light?

You can grow plants in artificial light. This is through theprocess known as hydroponics which can use incandescent, florescentor LED bulbs within an enclosed environment.

Can a plant grow with a blue light?

Depends on what kind of plant. Plants with red and yellow leaves, such as maple, absorb more blue light. I use a blue LED light for my herbs growing. And my herbs are growing well.

How do plants use light to grow?

Photosynthesis is a metabolic pathway that converts light energy into chemical energy. Its initial substrates are carbon dioxide and water; the energy source is sunlight (electromagnetic radiation); and the end-products are oxygen and (energy-containing) carbohydrates, such as sucrose, glucose or starch. This process is one of the most important biochemical pathways, [1] since nearly all life on Earth either directly or indirectly depends on it as a source of energy. It is a complex process occurring in plants, algae, as well as bacteria such as cyanobacteria. Photosynthetic organisms are also referred to as Photoautotrophs Photosynthesis uses light energy and carbon dioxide to make triose phosphates (G3P). G3P is generally considered the first end-product of photosynthesis. [ citation needed ] It can be used as a source of metabolic energy, or combined and rearranged to form monosaccharide or disaccharide sugars, such as glucose or sucrose, respectively, which can be transported to other cells, stored as insoluble polysaccharides such as starch, or converted to structural carbohydrates, such as cellulose or glucans. A commonly used slightly simplified equation for photosynthesis is:. 6 CO 2(g) + 12 H 2 O (l) + photons → C 6 H 12 O 6 (aq) + 6 O 2(g) + 6 H 2 O (l) carbon dioxide + water + light energy → glucose + oxygen + water . The equation is often presented in introductory chemistry texts in an even more simplified form as: [2] . 6 CO 2(g) + 6 H 2 O (l) + photons → C 6 H 12 O 6(aq) + 6 O 2(g) . Photosynthesis occurs in two stages. In the first stage, light-dependent reactions or photosynthetic reactions (also called the Light Reactions ) capture the energy of light and use it to make high-energy molecules. During the second stage, the light-independent reactions (also called the Calvin-Benson Cycle, and formerly known as the Dark Reactions ) use the high-energy molecules to capture and chemically reduce carbon dioxide (CO 2 ) (also called carbon fixation) to make the precursors of carbohydrates. In the light reactions, one molecule of the pigment chlorophyll absorbs one photon and loses one electron. This electron is passed to a modified form of chlorophyll called pheophytin, which passes the electron to a quinone molecule, allowing the start of a flow of electrons down an electron transport chain that leads to the ultimate reduction of NADP to NADPH. In addition, this creates a proton gradient across the chloroplast membrane; its dissipation is used by ATP Synthase for the concomitant synthesis of ATP. The chlorophyll molecule regains the lost electron from a water molecule through a process called photolysis, which releases a dioxygen (O 2 ) molecule. In the Light-independent or dark reactions the enzyme RuBisCO captures CO 2 from the atmosphere and in a process that requires the newly formed NADPH, called the Calvin-Benson Cycle, releases three-carbon sugars, which are later combined to form sucrose and starch. Photosynthesis may simply be defined as the conversion of light energy into chemical energy by living organisms. It is affected by its surroundings, and the rate of photosynthesis is affected by the concentration of carbon dioxide in the air, the light intensity, and the temperature. Photosynthesis uses only 1% of the entire electromagnetic spectrum, and 2% of the visible spectrum. [ citation needed ] It has been estimated that the productivity of photosynthesis is 115 petagrams (Pg, equals 10 15 grams or 10 9 metric tons). [ citation needed ] In plants Most plants are photoautotrophs, which means that they are able to synthesize food directly from inorganic compounds using light energy - for example from the sun, instead of eating other organisms or relying on nutrients derived from them. This is distinct from chemoautotrophs that do not depend on light energy, but use energy from inorganic compounds.. 6 CO 2 + 12 H 2 O → C 6 H 12 O 6 + 6 O 2 + 6 H 2 O . The energy for photosynthesis ultimately comes from absorbed photons and involves a reducing agent, which is water in the case of plants, releasing oxygen as product. The light energy is converted to chemical energy (known as light-dependent reactions), in the form of ATP and NADPH, which are used for synthetic reactions in photoautotrophs. The overall equation for the light-dependent reactions under the conditions of non-cyclic electron flow in green plants is: [3] . 2 H 2 O + 2 NADP + + 2 ADP + 2 P i + light → 2 NADPH + 2 H + + 2 ATP + O 2 . Most notably, plants use the chemical energy to fix carbon dioxide into carbohydrates and other organic compounds through light-independent reactions. The overall equation for carbon fixation (sometimes referred to as carbon reduction) in green plants is: [3] . 3 CO 2 + 9 ATP + 6 NADPH + 6 H + → C 3 H 6 O 3 -phosphate + 9 ADP + 8 P i + 6 NADP + + 3 H 2 O . To be more specific, carbon fixation produces an intermediate product, which is then converted to the final carbohydrate products. The carbon skeletons produced by photosynthesis are then variously used to form other organic compounds, such as the building material cellulose, as precursors for lipid and amino acid biosynthesis, or as a fuel in cellular respiration. The latter occurs not only in plants but also in animals when the energy from plants gets passed through a food chain. Organisms dependent on photosynthetic and chemosynthetic organisms are called heterotrophs. In general outline, cellular respiration is the opposite of photosynthesis: Glucose and other compounds are oxidized to produce carbon dioxide, water, and chemical energy. However, the two processes take place through a different sequence of chemical reactions and in different cellular compartments. Plants absorb light primarily using the pigment chlorophyll, which is the reason that most plants have a green color. The function of chlorophyll is often supported by other accessory pigments such as carotenes and xanthophylls. Both chlorophyll and accessory pigments are contained in organelles (compartments within the cell) called chloroplasts. Although all cells in the green parts of a plant have chloroplasts, most of the energy is captured in the leaves. The cells in the interior tissues of a leaf, called the mesophyll, can contain between 450,000 and 800,000 chloroplasts for every square millimeter of leaf. The surface of the leaf is uniformly coated with a water-resistant waxy cuticle that protects the leaf from excessive evaporation of water and decreases the absorption of ultraviolet or blue light to reduce heating. The transparent epidermis layer allows light to pass through to the palisade mesophyll cells where most of the photosynthesis takes place. Plants convert light into chemical energy with a maximum photosynthetic efficiency of approximately 6%. [4] [5] [6] By comparison solar panels convert light into electric energy at a photosynthetic efficiency of approximately 10-20%. Actual plant's photosynthetic efficiency varies with the frequency of the light being converted, light intensity, temperature and proportion of CO 2 in atmosphere. In algae and bacteria Algae come in multiple forms from multicellular organisms like kelp, to microscopic, single-cell organisms. Although they are not as complex as land plants, the biochemical process of photosynthesis is the same. Very much like plants, algae have chloroplasts and chlorophyll, but various accessory pigments are present in some algae such as phycocyanin, carotenes, and xanthophylls in green algae and phycoerythrin in red algae (rhodophytes), resulting in a wide variety of colors. Brown algae and diatoms contain fucoxanthol as their primary pigment. All algae produce oxygen, and many are autotrophic. However, some are heterotrophic, relying on materials produced by other organisms. For example, in coral reefs, there is a mutualistic relationship between zooxanthellae and the coral polyps. [7] Photosynthetic bacteria do not have chloroplasts (or any membrane-bound organelles). Instead, photosynthesis takes place directly within the cell. Cyanobacteria contain thylakoid membranes very similar to those in chloroplasts and are the only prokaryotes that perform oxygen-generating photosynthesis. In fact, chloroplasts are now considered to have evolved from an endosymbiotic bacterium, which was also an ancestor of cyanobacterium. The other photosynthetic bacteria have a variety of different pigments, called bacteriochlorophylls, and use electron donors different from water and thus do not produce oxygen. Some bacteria, such as Chromatium , oxidize hydrogen sulfide instead of water for photosynthesis, producing sulfur as waste. Other photosynthetic bacteria oxidize ferrous iron to ferric iron, [8] others nitrite to nitrate, [9] and still others use arsenites, producing arsenates. [10] All photosynthesizing organisms must be in the photic (light-receiving) zone, except for those near hydrothermal vents which give faint light. Evolution Plant cells with visible chloroplasts.. Early photosynthetic systems, such as those from green and purple sulfur and green and purple non-sulfur bacteria, are thought to have been anoxygenic, using various molecules as electron donors. Green and purple sulfur bacteria are thought to have used hydrogen and sulfur as an electron donor. Green nonsulfur bacteria used various amino and other organic acids. Purple nonsulfur bacteria used a variety of non-specific organic molecules. The use of these molecules is consistent with the geological evidence that the atmosphere was highly reduced at that time. [ citation needed ] Fossils of what are thought to be filamentous photosynthetic organisms have been dated at 3.4 billion years old. [11] The main source of oxygen in the atmosphere is oxygenic photosynthesis, and its first appearance is sometimes referred to as the oxygen catastrophe. Geological evidence suggests that oxygenic photosynthesis, such as that in cyanobacteria, became important during the Paleoproterozoic era around 2 billion years ago. Modern photosynthesis in plants and most photosynthetic prokaryotes is oxygenic. Oxygenic photosynthesis uses water as an electron donor which is oxidized to molecular dioxygen (O 2 ) in the photosynthetic reaction center. Origin of chloroplasts In plants photosynthesis occurs in organelles called chloroplasts. Chloroplasts have many similarities with photosynthetic bacteria including a circular chromosome, prokaryotic-type ribosomes, and similar proteins in the photosynthetic reaction center. [12] [13] The endosymbiotic theory suggests that photosynthetic bacteria were acquired (by endocytosis) by early eukaryotic cells to form the first plant cells. Therefore, chloroplasts may be photosynthetic bacteria that adapted to life inside plant cells. Like mitochondria, chloroplasts still possess their own DNA, separate from the nuclear DNA of their plant host cells and the genes in this chloroplast DNA resemble those in cyanobacteria. [14] Marine molluscs Elysia viridis and Elysia chlorotica likewise maintain a symbiotic relationship with chloroplasts that they capture from the algae that they ingest. This allows the molluscs to survive solely by photosynthesis for several months at a time. [15] Cyanobacteria and the evolution of photosynthesis The biochemical capacity to use water as the source for electrons in photosynthesis evolved once, in a common ancestor of extant cyanobacteria. The geological record indicates that this transforming event took place early in Earth's history, at least 2450-2320 million years ago (Ma), and possibly much earlier. [ citation needed ] Available evidence from geobiological studies of Archean (>2500 Ma) sedimentary rocks indicates that life existed 3500 Ma, but the question of when oxygenic photosynthesis evolved is still unanswered. A clear paleontological window on cyanobacterial evolution opened about 2000 Ma, revealing an already-diverse biota of blue-greens. Cyanobacteria remained principal primary producers throughout the Proterozoic Eon (2500-543 Ma), in part because the redox structure of the oceans favored photoautotrophs capable of nitrogen fixation. [ citation needed ] Green algae joined blue-greens as major primary producers on continental shelves near the end of the Proterozoic, but only with the Mesozoic (251-65 Ma) radiations of dinoflagellates, coccolithophorids, and diatoms did primary production in marine shelf waters take modern form. Cyanobacteria remain critical to marine ecosystems as primary producers in oceanic gyres, as agents of biological nitrogen fixation, and, in modified form, as the plastids of marine algae. [16] Molecular production Light-dependent reactions of photosynthesis at the thylakoid membrane. Temporal Order The overall process of photosynthesis takes place in four stages. The first, energy transfer in antenna chlorophyll takes place in the femtosecond [1 femtosecond (fs) = 10, −15 s] to picosecond [1 picosecond (PS) = 10 −12 s] time scale. The next phase, the transfer of electrons in photochemical reactions, takes place in the picosecond to nanosecond time scale [1 nanosecond (ns) = 10 −9 s]. The third phase, the electron transport chain and ATP synthesis, takes place on the microsecond [1 microsecond (μs) = 10 −6 s] to millisecond [1 millisecond (ms) = 10 −3 s) time scale. The final phase is carbon fixation and export of stable products and takes place in the millisecond to second time scale. The first three stages occur in the thylakoid membranes. Light to chemical energy . Main article: Light-dependent reaction . The light energy is converted to chemical energy using the light-dependent reactions. This chemical energy production is about 5-6% efficient, with the majority of the light that strikes a plant reflected and not absorbed. [4] However, of the energy that is absorbed, approximately 30-50% is captured as chemical energy. [17] The products of the light-dependent reactions are ATP from photophosphorylation and NADPH from photoreduction. Both are then utilized as an energy source for the light-independent reactions. Not all wavelengths of light can support photosynthesis. The photosynthetic action spectrum depends on the type of accessory pigments present. For example, in green plants, the action spectrum resembles the absorption spectrum for chlorophylls and carotenoids with peaks for violet-blue and red light. In red algae, the action spectrum overlaps with the absorption spectrum of phycobilins for blue-green light, which allows these algae to grow in deeper waters that filter out the longer wavelengths used by green plants. The non-absorbed part of the light spectrum is what gives photosynthetic organisms their color (e.g., green plants, red algae, purple bacteria) and is the least effective for photosynthesis in the respective organisms. Z scheme A Photosystem: A light-harvesting cluster of photosynthetic pigments present in the thylakoid membrane of chloroplasts.. The "Z scheme". In plants, light-dependent reactions occur in the thylakoid membranes of the chloroplasts and use light energy to synthesize ATP and NADPH. The light-dependent reaction has two forms; cyclic and non-cyclic reaction. In the non-cyclic reaction, the photons are captured in the light-harvesting antenna complexes of photosystem II by chlorophyll and other accessory pigments (see diagram at right). When a chlorophyll molecule at the core of the photosystem II reaction center obtains sufficient excitation energy from the adjacent antenna pigments, an electron is transferred to the primary electron-acceptor molecule, Pheophytin, through a process called Photoinduced charge separation. These electrons are shuttled through an electron transport chain, the so called Z-scheme shown in the diagram, that initially functions to generate a chemiosmotic potential across the membrane. An ATP synthase enzyme uses the chemiosmotic potential to make ATP during photophosphorylation, whereas NADPH is a product of the terminal redox reaction in the Z-scheme . The electron enters the Photosystem I molecule. The electron is excited due to the light absorbed by the photosystem. A second electron carrier accepts the electron, which again is passed down lowering energies of electron acceptors. The energy created by the electron acceptors is used to move hydrogen ions across the thylakoid membrane into the lumen. The electron is used to reduce the co-enzyme NADP, which has functions in the light-independent reaction. The cyclic reaction is similar to that of the non-cyclic, but differs in the form that it generates only ATP, and no reduced NADP (NADPH) is created. The cyclic reaction takes place only at photosystem I. Once the electron is displaced from the photosystem, the electron is passed down the electron acceptor molecules and returns back to photosystem I, from where it was emitted, hence the name cyclic reaction . Water photolysis. Main articles: Photodissociation and Oxygen evolution . The NADPH is the main reducing agent in chloroplasts, providing a source of energetic electrons to other reactions. Its production leaves chlorophyll with a deficit of electrons (oxidized), which must be obtained from some other reducing agent. The excited electrons lost from chlorophyll in photosystem I are replaced from the electron transport chain by plastocyanin. However, since photosystem II includes the first steps of the Z-scheme , an external source of electrons is required to reduce its oxidized chlorophyll a molecules. The source of electrons in green-plant and cyanobacterial photosynthesis is water. Two water molecules are oxidized by four successive charge-separation reactions by photosystem II to yield a molecule of diatomic oxygen and four hydrogen ions; the electron yielded in each step is transferred to a redox-active tyrosine residue that then reduces the photoxidized paired-chlorophyll a species called P680 that serves as the primary (light-driven) electron donor in the photosystem II reaction center. The oxidation of water is catalyzed in photosystem II by a redox-active structure that contains four manganese ions and a calcium ion; this oxygen-evolving complex binds two water molecules and stores the four oxidizing equivalents that are required to drive the water-oxidizing reaction. Photosystem II is the only known biological enzyme that carries out this oxidation of water. The hydrogen ions contribute to the transmembrane chemiosmotic potential that leads to ATP synthesis. Oxygen is a waste product of light-independent reactions, but the majority of organisms on Earth use oxygen for cellular respiration, including photosynthetic organisms. [18] [19] Quantum mechanical effects Through photosynthesis, sunlight energy is transferred to molecular reaction centers for conversion into chemical energy with nearly 100-percent efficiency. The transfer of the solar energy takes place almost instantaneously, so little energy is wasted as heat. Of the total incident solar radiation only 43% can be used (only light in the range 400-700 nm), 80% of light makes it through the canopy, photosynthesis stores 28.6% of the energy, and plant respiration uses some energy which leaves 67% of the stored energy behind. This brings the actual efficiency of photosynthesis to about 6.6%. [6] A study led by researchers with the U.S. Department of Energy's Lawrence Berkeley National Laboratory (Berkeley Lab) and the University of California at Berkeley suggests that long-lived wavelike electronic quantum coherence plays an important part in this instantaneous transfer of energy by allowing the photosynthetic system to simultaneously try each potential energy pathway and choose the most efficient option. Results of the study are presented in the April 12, 2007 issue of the journal Nature . [20] Oxygen and photosynthesis With respect to oxygen and photosynthesis, there are two important concepts. . Plant and cyanobacterial (blue-green algae) cells also use oxygen for cellular respiration, although they have a net output of oxygen since much more is produced during photosynthesis. . Oxygen is a product of the light-driven water-oxidation reaction catalyzed by photosystem II ; it is not generated by the fixation of carbon dioxide. Consequently, the source of oxygen during photosynthesis is water, not carbon dioxide. Bacterial variation The concept that oxygen production is not directly associated with the fixation of carbon dioxide was first proposed by Cornelis Van Niel in the 1930s, who studied photosynthetic bacteria. Aside from the cyanobacteria, bacteria only have one photosystem and use reducing agents other than water. They get electrons from a variety of different inorganic chemicals including sulfide or hydrogen, so for most of these bacteria oxygen is not produced. Others, such as the halophiles (an Archaea), produced so-called purple membranes where the bacteriorhodopsin could harvest light and produce energy. The purple membranes was one of the first to be used to demonstrate the chemiosmotic theory: light hit the membranes and the pH of the solution that contained the purple membranes dropped as protons were pumping out of the membrane. Overview of the Calvin cycle and carbon fixation. Carbon fixation . Main articles: Carbon fixation and Light-independent reaction . The fixation or reduction of carbon dioxide is a light-independent process in which carbon dioxide combines with a five-carbon sugar, ribulose 1,5-bisphosphate (RuBP), to yield two molecules of a three-carbon compound, glycerate 3-phosphate (GP), also known as 3-phosphoglycerate (PGA). GP, in the presence of ATP and NADPH from the light-dependent stages, is reduced to glyceraldehyde 3-phosphate (G3P). This product is also referred to as 3-phosphoglyceraldehyde (PGAL) or even as triose phosphate. Triose is a 3-carbon sugar (see carbohydrates). Most (5 out of 6 molecules) of the G3P produced is used to regenerate RuBP so the process can continue (see Calvin-Benson cycle). The 1 out of 6 molecules of the triose phosphates not "recycled" often condense to form hexose phosphates, which ultimately yield sucrose, starch and cellulose. The sugars produced during carbon metabolism yield carbon skeletons that can be used for other metabolic reactions like the production of amino acids and lipids. C 4 and C 3 photosynthesis and CAM Overview of C4 carbon fixation. In hot and dry conditions, plants will close their stomata to prevent loss of water. Under these conditions, CO 2 will decrease, and dioxygen gas, produced by the light reactions of photosynthesis, will increase in the leaves, causing an increase of photorespiration by the oxygenase activity of ribulose-1,5-bisphosphate carboxylase/oxygenase and decrease in carbon fixation. Some plants have evolved mechanisms to increase the CO 2 concentration in the leaves under these conditions.. Main article: C4 carbon fixation . C 4 plants chemically fix carbon dioxide in the cells of the mesophyll by adding it to the three-carbon molecule phosphoenolpyruvate (PEP), a reaction catalyzed by an enzyme called PEP carboxylase and which creates the four-carbon organic acid, oxaloacetic acid. Oxaloacetic acid or malate synthesized by this process is then translocated to specialized bundle sheath cells where the enzyme, rubisco, and other Calvin cyle enzymes are located, and where CO 2 released by decarboxylation of the four-carbon acids is then fixed by rubisco activity to the three-carbon sugar 3-phosphoglycerate. The physical separation of rubisco from the oxygen-generating light reactions reduces photorespiration and increases CO 2 fixation and thus photosynthetic capacity of the leaf. [21] C 4 plants can produce more sugar than C 3 plants in conditions of high light and temperature. Many important crop plants are C 4 plants including maize, sorghum, sugarcane, and millet. Plants lacking PEP-carboxylase are called C 3 plants because the primary carboxylation reaction, catalyzed by Rubiso, produces the three-carbon sugar 3-phosphoglycerate directly in the Calvin-Benson Cycle.. Main article: CAM photosynthesis . Xerophytes such as cacti and most succulents also use PEP carboxylase to capture carbon dioxide in a process called Crassulacean acid metabolism (CAM). In contrast to C4 metabolism, which physically separates the CO 2 fixation to PEP from the Calvin cycle, CAM only temporally separates these two processes. CAM plants have a different leaf anatomy than C 4 plants, and fix the CO 2 at night, when their stomata are open. CAM plants store the CO 2 mostly in the form of malic acid via carboxylation of phosphoenolpyruvate to oxaloacetate, which is then reduced to malate. Decarboxylation of malate during the day releases CO 2 inside the leaves thus allowing carbon fixation to 3-phosphoglycerate by rubisco. Discovery Although some of the steps in photosynthesis are still not completely understood, the overall photosynthetic equation has been known since the 1800s. Jan van Helmont began the research of the process in the mid-1600s when he carefully measured the mass of the soil used by a plant and the mass of the plant as it grew. After noticing that the soil mass changed very little, he hypothesized that the mass of the growing plant must come from the water, the only substance he added to the potted plant. His hypothesis was partially accurate - much of the gained mass also comes from carbon dioxide as well as water. However, this was a signaling point to the idea that the bulk of a plant's biomass comes from the inputs of photosynthesis, not the soil itself. Joseph Priestley, a chemist and minister, discovered that when he isolated a volume of air under an inverted jar, and burned a candle in it, the candle would burn out very quickly, much before it ran out of wax. He further discovered that a mouse could similarly "injure" air. He then showed that the air that had been "injured" by the candle and the mouse could be restored by a plant. In 1778, Jan Ingenhousz, court physician to the Austrian Empress, repeated Priestley's experiments. He discovered that it was the influence of sunlight on the plant that could cause it to rescue a mouse in a matter of hours. In 1796, Jean Senebier, a Swiss pastor, botanist, and naturalist, demonstrated that green plants consume carbon dioxide and release oxygen under the influence of light. Soon afterwards, Nicolas-Théodore de Saussure showed that the increase in mass of the plant as it grows could not be due only to uptake of CO 2 , but also to the incorporation of water. Thus the basic reaction by which photosynthesis is used to produce food (such as glucose) was outlined. Cornelis Van Niel made key discoveries explaining the chemistry of photosynthesis. By studying purple sulfur bacteria and green bacteria he was the first scientist to demonstrate that photosynthesis is a light-dependent redox reaction, in which hydrogen reduces carbon dioxide. Robert Emerson discovered two light reactions by testing plant productivity using different wavelengths of light. With the red alone, the light reactions were suppressed. When blue and red were combined, the output was much more substantial. Thus, there were two photosystems, one aborbing up to 600 nm wavelengths, the other up to 700. The former is known as PSII, the latter is PSI. PSI contains only chlorophyll a, PSII contains primarily chlorophyll a with most of the available chlorophyll b, among other pigments. [22] Further experiments to prove that the oxygen developed during the photosynthesis of green plants came from water, were performed by Robert Hill in 1937 and 1939. He showed that isolated chloroplasts give off oxygen in the presence of unnatural reducing agents like iron oxalate, ferricyanide or benzoquinone after exposure to light. The Hill reaction is as follows:. 2 H 2 O + 2 A + (light, chloroplasts) → 2 AH 2 + O 2 . where A is the electron acceptor. Therefore, in light the electron acceptor is reduced and oxygen is evolved. Cyt b 6 , now known as a plastoquinone, is one electron acceptor. Samuel Ruben and Martin Kamen used radioactive isotopes to determine that the oxygen liberated in photosynthesis came from the water. Melvin Calvin and Andrew Benson, along with James Bassham, elucidated the path of carbon assimilation (the photosynthetic carbon reduction cycle) in plants. The carbon reduction cycle is known as the Calvin cycle, which inappropriately ignores the contribution of Bassham and Benson. Many scientists refer to the cycle as the Calvin-Benson Cycle, Benson-Calvin, and some even call it the Calvin-Benson-Bassham (or CBB) Cycle. A Nobel Prize winning scientist, Rudolph A. Marcus, was able to discover the function and significance of the electron transport chain. Factors There are three main factors affecting photosynthesis and several corollary factors. The three main are: . Light irradiance and wavelength . Carbon dioxide concentration . Temperature. Light intensity (irradiance), wavelength and temperature In the early 1900s Frederick Frost Blackman along with Gabrielle Matthaei investigated the effects of light intensity (irradiance) and temperature on the rate of carbon assimilation. . At constant temperature, the rate of carbon assimilation varies with irradiance, initially increasing as the irradiance increases. However at higher irradiance this relationship no longer holds and the rate of carbon assimilation reaches a plateau. . At constant irradiance, the rate of carbon assimilation increases as the temperature is increased over a limited range. This effect is only seen at high irradiance levels. At low irradiance, increasing the temperature has little influence on the rate of carbon assimilation. These two experiments illustrate vital points: firstly, from research it is known that photochemical reactions are not generally affected by temperature. However, these experiments clearly show that temperature affects the rate of carbon assimilation, so there must be two sets of reactions in the full process of carbon assimilation. These are of course the light-dependent 'photochemical' stage and the light-independent, temperature-dependent stage. Second, Blackman's experiments illustrate the concept of limiting factors. Another limiting factor is the wavelength of light. Cyanobacteria, which reside several meters underwater, cannot receive the correct wavelengths required to cause photoinduced charge separation in conventional photosynthetic pigments. To combat this problem, a series of proteins with different pigments surround the reaction center. This unit is called a phycobilisome. Carbon dioxide levels and photorespiration As carbon dioxide concentrations rise, the rate at which sugars are made by the light-independent reactions increases until limited by other factors. RuBisCO, the enzyme that captures carbon dioxide in the light-independent reactions, has a binding affinity for both carbon dioxide and oxygen. When the concentration of carbon dioxide is high, RuBisCO will fix carbon dioxide. However, if the oxygen concentration is high, RuBisCO will bind oxygen instead of carbon dioxide. This process, called photorespiration, uses energy, but does not make sugar. RuBisCO oxygenase activity is disadvantageous to plants for several reasons: . One product of oxygenase activity is phosphoglycolate (2 carbon) instead of 3-phosphoglycerate (3 carbon). Phosphoglycolate cannot be metabolized by the Calvin-Benson cycle and represents carbon lost from the cycle. A high oxygenase activity, therefore, drains the sugars that are required to recycle ribulose 5-bisphosphate and for the continuation of the Calvin-Benson cycle. . Phosphoglycolate is quickly metabolized to glycolate that is toxic to a plant at a high concentration; it inhibits photosynthesis. . Salvaging glycolate is an energetically expensive process that uses the glycolate pathway and only 75% of the carbon is returned to the Calvin-Benson cycle as 3-phosphoglycerate. . A highly-simplified summary is: . ::: 2 glycolate + ATP → 3-phophoglycerate + carbon dioxide + ADP +NH 3 . The salvaging pathway for the products of RuBisCO oxygenase activity is more commonly known as photorespiration, since it is characterized by light-dependent oxygen consumption and the release of carbon dioxide.

Why do plants grow in red light?

I am doing an experiment on growing sunflowers in different lights. I am using red, blue and white. I need to know why the ones in the red light and white light are doing so good and the ones in the blue light have died. Can you give me some insight on this please

Will a plant grow in a black light?

Yes, if the black light only emits UV-A, and meets the requirement of intensity required by the plant. UV-B will damage the plant's DNA, and UV-C will make ozone also damaging the plant.

How does light make plants grow?

through the process of photosynthesis. light and water are absorbed during the light reaction of photosynthesis. the light is absorbed in the chloroplasts thylakoid membranes. this excites electrons. electrons dont "like" to be at this unstable state so they find something to bond with. then the H20 (water) comes in: first the water molecule splits. the result of this split is a release of oxygen (O2) as waste. the hydrogen (H) is then used to accept and carry the excited electrons over to the dark reaction with the help of the coenzyme NAD.

Can you grow a plant with light beer?

There was a roumer that a plant called "the saloon plant" that was reportedly watered with beer (it was grown indoors so it didn't have any light) and it never seemed to die. But I wouldn't try that with other plants.

Do plants grow without light?

no, because they need light to practice photosynthesis, this produces energy (glucose) for the plant

Can red light grow plants?

the answer to wash a cup is to put three fingers in it and push in and out and thts how u wash a cup

Why do plants grow towards light?

Plants reacting to light is called phototropism. As plants need light to survive, by growing towards the direction of the light they give themselves the best chance of getting the most light.. Plants can tell the direction of the light because their surface has chemicals that react to light. These chemicals encourage growth in whichever direction has the highest concentration, so the plant grows towards the light. Plants use the sunlight for photosynthesis.

Why is soil good for plants to grow in?

Hi there soil helps a plant and their health because it contains all the vitamins and minerals which helps plants to be healthier and to also help them produce their own chemicals such as chlorofil the green pigment, the vitamins and minerals in soil nourish the plant and is taken to different areas of the plant where needed.

Can you grow plants with a light bulb?

yes you can because the rays of the lightbulb are kind of like the rays of the sun

Can plants grow with artificial light?

Plants are grown in artificial light all the time. As long as the photons of light are of the correct wavelength the plant does not care where the light comes from.

Can a plant grow with a folresent light?

yes actually a plant can grow into bright folresnt light .but will not be provided with vital vitamins that a sun can give.

Why is loam good for growing plants?

Loam is good for growing plants because there are a lot of minerals.hThere is decay in loam.That helps plants grow too.Very many organic matters from the mixture of moist clay soil is good for planting.

Will a hps light be good for growing?

\nYes, High Pressure Sodium is commonly used for growing, just make sure you know your veg and fruit cycles.

What plant grow in lo light?

All will but most will struggle.. Ones that don't struggle so much are typically ones naturally found in woodland or forest under-storey - like monstera, aspidistra, trillium, ferns, ....................

Why do plants grow to the light?

Plants phtosynthesise to produce energy. Photosynthesis involves turning light energy into chemical energy (glucose) so plants grow towards light so that they can absorb more light and therefore produce more energy that they use to grow etc.

Is a 200w CFL light good enough to grow 4 plants under?

No you would need a 400 watt hps lamp for flowering but you could probably use that cfl for the veg period

Why do plants grow in the light?

they grow in the light because they get their energy and food from the sunlight

How do plants grow in red light?

You can check out the answer yourself , by a simple experiment. Plant some seeds in a pot.Wrap it with red Cellophane paper. After some days, you will see that only few plants are grown; but those are tall.

Is compost good for growing plants?

Compost is great for plants absolutely the best thing! All of the nutrients from the food areabsorbed into the compost. Yes! Use it!

Can plant grow on artificial light?

Most greenhouses use artificial lighting (or grow lights) to supplement daylight, for instance, to trick the plant into thinking it is a long hot summer day when it is snowing outside. The latest technology uses LED light bulbs, which can be designed to emit the colors of light that best suit photosynthesis, mostly 80% red and 20% blue LEDs rather than trying to emulate the full daylight spectrum. Heating is usually provided by dedicated heaters, so infrared lighting is not necessary. Ultraviolet light has a disinfecting role in natural sunlight, so it may be needed, although there are no studies about its importance in a sanitary controlled environment such as a greenhouse. Plants are not just about chlorophyll though, it is not entirely clear if other light frequency in the daylight spectrum may benefit plant growing for other reasons, especially if growing them totally out of a natural daylight environment. So yes, plants can grow entirely on artificial light, like underground or maybe on the International Space Station, not even in a green house. But apart from marijuana, there is currently no plant that is grown entirely on artificial light, so we don't have sufficient information to tell if just red and blue lights are viable in the long term. LED lighting is also much cheaper to run than other artificial light sources, and the best LED grow light panels are usually assembled in such a way that you can adjust by software the ratio of red vs. blue light, for different stages of the culture (seedlings, flowers), different crops (leafy vs. root vegetables), seasons, regions, etc. Red and blue light does not look strong enough to us, but it is because human eyes are more sensible to green/yellow light. For a plant, these LED lights are plenty, assuming you follow the manufacturer's instructions. LEDs run on DC current, so they are also perfect for DC power sources such as solar panels, reducing the power usage even more than the LED lights in our houses, which require a DC/AC converter and a huge heat dissipator because of heat generated by the converter. I linked a few reputable LED manufacturers' web sites.

In what light do plants grow better?

plants grow very well on the sunlight. it can prepare photosynthesis with this sunlight. it gets lots of vitamin-D in the sunlight

How do plants grow in light?

from light and water not only light,but from light plants take the power of it

Will plants grow with no light?

Yes, plants store excess glucose they don't need as starch so when there is no light the plant can survive of the excess starch but only for a certain amount of time.

Why does plants need light to grow?

Light is an energy source that drives the chemical reaction called photosynthesis, which plants use to manufacture sugar.

Why plants grow better in light?

Plants grow better in light because plants make their own food. They need sunlight to produce their food cells, as they need water, and soil.

Does light color grow plants?

Plants, in fact, do grow faster under certain colors of light. The reason for this is that chloroplasts can only absorb certain wave lengths of light because of the pigments they contain. There are 2 photo systems in plants called photo system I and II. PS I absorbs light on the wavelength of 700nm while PS II absorbs 680nm because of their utilization of chlorophyll A and B Green plants will grow SLOWER or not at all under green light. Basically, green is the only brand of light that the plant's chloroplasts doesn't use. That is why it is the only colour reflected from the leaf, and is what we see.

Why does the growing plant need the light?

The growing plant requires photosynthesis, without light photosynthesis is unable to take place. Plants feed off photosynthesis as they consume Carbon Dioxide and Water, with these things they are able to produce chlorophyll using their chloroplasts and light, which hence enables them to produce glucose and Oxygen gas which we require to balance the Carbon Dioxide intake with the Oxygen intake.

Why does a plant grow toward the light?

A plant is a living organism just like us. If we needed water and were in the desert, where would we go? Towards a river. A plant is just like that. Plants need sunlight to make food, and therefore to survive. A plant is attracted to sunlight and will grow towards the sunlight to maximize the amount of sunlight it receives which will help it make more food.

Why do plants grow more in light?

They use chlorophyl in their leaves to turn the light into glucose (food) and therefore with more light, they get more food, so grow faster.

Where is a good place to grow plants?

If you live in an apartment you should put it on the balcony where it can get lots of sunlight. If you live in a house you should plant it outside in your garden. If you have A HUGE yard, then you should build a green house to grow your plants. Be sure not to use any chemicals because if you are planting food it will not be good to eat!

What lighting does a plant grow best?

\n Plants all grow differently in different lighting, depending on the plant it could grow best in shade or direct sunlight it all depends on what the plant is.

Is there light on the moon to grow plants?

There is light on the moon. However, none of the other necessarythings are present. There is no air, no liquid water, no soilnutrients, and nothing to shield against solar radiation.

What are good plants to grow in shade?

The best plants to plant in the shade will still depend on a variety of factors, including your soil type and your geographical location (overall temperature, moisture, etc.). Some shade-loving plants which traditionally are very hardy include geraniums, bleeding hearts, and hosta.

Is miracle grow good for plants or not?

Miracle Grow is a propriety plant food. It supplies feeding to plants. Whetherit is good for plants is open to discussion, on the whole plants benefit.