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Photosynthesis

This category is for questions about the chemical process in which autotrophic organisms use sunlight, carbon dioxide and water to make glucose, water and oxygen. This process is vital to life and is of great importance in biology.

6,415 Questions

How are pigments associated with photosynthesis?

Pigments are molecules that absorb light energy. In photosynthesis, pigments such as chlorophyll absorb light and transfer the energy to the reaction centers, where it is used to drive the conversion of carbon dioxide and water into glucose and oxygen. Pigments play a crucial role in capturing light energy for the process of photosynthesis to take place.

What happens to sunlight that strikes a leaf but is not trapped by chlorophyll?

Sunlight that is not trapped by chlorophyll in the leaf is either reflected, transmitted through the leaf, or absorbed as heat. Only a small portion of sunlight wavelengths are absorbed and utilized by chlorophyll for photosynthesis.

What are the formulas for photosynthesis and cell respiration?

See the questions in the "Related Questions" section below for each individual equation.

What are the chemical reactions involved in photosynthesis and cellular respiration?

The reaction for Photosynthesis = Light Energy + CO2 + H2O ----> Carbohydrate + O2

The reaction for C. Respiration = Carbohydrate + O2 -----> Energy + CO2 + H20 These reactions are the exact opposites of each other.

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Photosynthesis - 6CO2 + 6H2O ---> C6H12O6 + 6O2

Cellular Respiration - C6H12O6 + 6O2 ---> 6CO2 + 6H2O

Note that energy is used although it is not included in the chemical equation.

What do plants use for photosynthesis?

Plants use sunlight, water, and carbon dioxide for photosynthesis. Sunlight provides the energy needed to drive the process, while water and carbon dioxide are the raw materials that are converted into glucose, the primary energy source for the plant.

How does the special leaf anatomy of the C4 plant support C4 photosynthesis?

The special leaf anatomy of C4 plants, including the presence of Kranz anatomy (bundle sheath cells surrounding mesophyll cells), helps to spatially separate initial carbon fixation (by PEP carboxylase in mesophyll cells) from the Calvin cycle (in bundle sheath cells). This separation reduces photorespiration and improves the efficiency of carbon fixation, especially in high-temperature and high-light conditions.

What are the 9 indirect products of photosynthesis?

The indirect products of photosynthesis include oxygen, which is released as a byproduct, and glucose, which is stored in plants as a source of energy. Additionally, photosynthesis indirectly leads to the production of carbohydrates, fats, proteins, and other organic compounds that are essential for plant growth and metabolism.

Place where light reactions occur?

Light reactions occur in the thylakoid membranes of the chloroplasts in plant cells. Here, light energy is absorbed by chlorophyll and other pigments to drive the conversion of light energy into chemical energy, in the form of ATP and NADPH, which are used in the Calvin cycle to produce sugars.

Why don't onions contain chlorophyll?

The practical answer to this is that they don't need chloroplasts. Think of where an onion lives and how much light it normally receives. Chloroplasts only function in the presence of light. Because it costs energy to develop chloroplasts, it is not useful for the plant to put develop them if they won't function.

However accurate, this answer is a little simplified compared to what really happens. Chloroplasts are only one type of plastid, along with chromoplasts (causing the red color of peppers and tomatoes) and amyloplasts (storing starch in potatoes and corn). None of these plastids can be assembled from raw materials within the cell of a plant. Rather they all develop from another type of plastid called a proplastid. Proplastids are small and clear. They divide at the same time the cells divide, so every cell in a plant has proplastids. However, they are difficult to see in most plants because of their size.

One piece of evidence that the proplastids exist in onion cells is easily seen. Leave an onion exposed to light for several days or weeks. It will begin to grow new green leaves. Also, some of the outer layers of the bulb (actually leaves, too), will begin to green up, as their proplastids develop into chloroplasts. It is thought that plastids may be found in all living cells of a plant, and probably are present in every cell in the early stages of development. Later they become restricted to certain cells, and are abundant only in those which have specialized functions, such as photosynthesis, storage, and color manifestation. Plastids multiply freely by division, and in this way the large numbers present in some cells are in part secured. Plastids are present in the very young meristematic dells where they are very minute, the smallest being at the limit of [light, not electron] microscopic visibility.

Is it true about half the photosynthesis on earth is performed by phytoplankton?

Yes, it is estimated that about half of the photosynthesis on Earth is performed by phytoplankton, which are tiny aquatic plants found in oceans, lakes, and rivers. These microscopic organisms are crucial for marine ecosystems and play a significant role in producing oxygen and cycling carbon dioxide.

What is the overall reaction for photosynthesis?

6(CO2 + H2O) ---solar energy--> (C6H12O6) + 6(O2)

Where do 'dark reactions' take place?

Dark reactions, also known as the Calvin cycle, take place in the stroma of chloroplasts in plant cells. These reactions use the products of the light-dependent reactions to convert carbon dioxide into glucose through a series of enzyme-catalyzed steps.

Why do plants need energy?

Plants need energy for photosynthesis, which is the process they use to convert sunlight into chemical energy in the form of glucose. This energy is essential for the plants to grow, develop, and produce food for themselves.

What roles does oxygen play in photosynthesis and in cellular respiration?

In photosynthesis, oxygen is a gas that is given off by the plant as a by product, which it cannot use. In cellular respiration, oxygen is used to fuel the process, and without it, h20 is not produced and the pyruvic acid will turn into lactic acid in the muscles!

How does photosynthesis occur?

Photo synthesis occurs when plants containing a pigment, chlorophyll traps the energy in the sun and uses the energy to create a chemical reaction. Then raw materials, carbon dioxide and water are combined to make sugar(glucose). The left over energy is then stored in a form of starch and carbohydrates, in the leaves, roots and stem. It then releases its main byproduct oxygen.-Zahaa Safodien

Photos of plants growing under sunlight?

I'm unable to display images. However, you can search for "plants growing under sunlight" on any search engine to find a variety of images showcasing plants thriving in natural sunlight settings.

What are the end product of Krebs Cycle?

For each 2 molecules of pyruvic acid (pyruvates) you get the following:

2 ATP Molecules

6 NADH

2 FADH2

4 CO2 (by/waste products)

Carbon dioxide

AXI

What is photorespiration?

Photorespiration is a process in plants that occurs when rubisco, the enzyme responsible for carbon fixation, uses oxygen instead of carbon dioxide. This can happen in hot or dry conditions, leading to a wasteful process that reduces the efficiency of photosynthesis. Photorespiration can lower the productivity of plants.

How do substances for photosynthesis enter and leave the plant?

The gas for photosynthesis...carbon dioxide diffuses into the plant through its stomata ('holes' in the leaf's underside).

Water is transported through the plant in the xylem tube (waterproof tube that makes up part of the plants veins and covers the whole plants structure) as it is drawn up from the roots where it is absorbed. It is drawn up by the water evaporationg through the stomata.

The light obviously enters the leaf and enters the chloroplasts where it combines with the chlorophyll to provide the energy for the photosynthesis reaction.

The products from photosynthesis...glucose and oxygen are removed from the plant leaves. Glucose through the phloem tube (another of the veins) and oxygen through diffusion through the stomata or it is used up in respiration.

What are the products of the light reactions?

Adenosine triphosphate, Nicotinamide adenine dinucleotide phosphate (NADP+), NADPH, and oxygen.

More technically, non-cyclic photophosphorylation produces ATP (through an electron transport chain) for use in the cell and NADPH for use in the Calvin Cycle (light-independent reactions).

For those looking for a slightly different answer, you will want: D. all of the above

NADPH, O2 and ATP

What type of cells use mitosis?

Mitosis occurs in Multicellular Organisms (Plant & Animal Cells).

Why do plant cells need to carry out respiration?

plant cells, like any other cell, need a continuous supply of enery to live. if a cell stop functioning it dies and eventually the whole plant or systems dies.

plant cells can do both respiration and photosyntheis, whil animal cells can only do respiration, no photosynthesis.. :D

What are the organeles within cells where energy is released from nutrient molecules?

The organelles where energy is released from nutrient molecules are called mitochondria. These organelles are often referred to as the powerhouse of the cell because they produce the majority of the cell's energy currency, known as adenosine triphosphate (ATP), through a process called cellular respiration.

Causticization process used for preparation which chemical?

The causticization process is used to create sodium hydroxide from sodium carbonate or soda ash by reacting it with calcium hydroxide. This reaction produces sodium hydroxide and calcium carbonate as byproducts.

Where do light dependent reactions take place?

Light dependent reactions occur in the thylakoid membrane of the chloroplasts in photosynthetic organisms. The products (ATP and NADPH) are used in the second stage of photosynthesis, which is called the Calvin Cycle. (Oxygen is given off as a "waste" product--lucky for us!)