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I would go with dark being the absence of light, since light is actually something (electromagnetic waves).

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Q: How long will dark reactions run in the absence of light?
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Can the light dependant reactions occur without the light independent reactions?

No, the light reactions occur while light is present; however, the Calvin Cycle or light-independent reactions can occur any time. The light-independent reactions require photons, or energy stored from the light reactions, to complete photosynthesis.


Why is the second stage of photosynthesis called light independent reaction?

The light-independent reactions are sometimes referred to as the dark reactions, though that term may be misleading as they do not actually require darkness to proceed. The term "light-independent" is used to emphasize that the reactions occur regardless of the amount of light present as long as the proper substrate compounds are available. Even this term can be criticized, however, as the availability of substrates in plants depends on photosynthesis, so the reactions cannot be said to be entirely "light-independent." Furthermore, the term "dark reactions" may be more accurate in CAM (Crassulacean acid metabolism) plants, which only take up CO2, which is necessary for the reactions to proceed, at night.http://en.wikipedia.org/wiki/Light-independent_reaction


What is the importance of light in photosynthesis?

The equation of photosynthesis is as below:Carbon dioxide + Water ---------> Glucose + OxygenThis reaction takes place in the presence of light and chlorophyll.The process of photosynthesis is completed in two stages:-Light Reactions: When light falls on leaves, it is absorbed by the chlorophyll in the chloroplasts. The solar energy is utilized to split water into oxygen and hydrogen, this process is called photolysis, and oxygen is released during this process. As these reactions take place only in the presence light, they are called light reactions.During light reactions two compounds are formed when solar energy is converted into chemical energy, these are:NADPH (Nicotinamide Adenine Di-nucleotide Phosphate)ATP (Adenosine Tri-Phosphate)NADP already exists in the cells of the leaf. The hydrogen released on the photolysis of water molecule is accepted by this compound and it becomes reduced to form NADPH.NADP (in cell) + H (from water) ---------> NADPHThis reaction takes place in the presence of light and enzymes.The compound ADP (Adenosine Di-Phosphate) is already present in the cells of the leaf and combines with the phosphate group using light energy to form a compound called ATP.ADP + P ---------> ATPThis reaction also takes place in the presence of light and enzymes.These compounds are energy rich and are needed for the dark reactions in photosynthesis.Dark Reactions: Utilizing the energy from ATP and the hydrogen from NADPH, water combines with carbon dioxide to form carbohydrates. Thus, the solar energy is now converted into chemical energy to form glucose. Other organic compounds are further synthesized from this glucose.This stage is also completed in a series of chemical reactions with the help of enzymes . Scientists have discovered an interesting thing about these two stages: only the first requires light, and the second can occur in the dark. So we call these reactions light and dark reactions respectively. Neither light energy nor chlorophyll are required for the dark reactions.Various steps of the dark reactions were studied by a scientist named Melvin Calvin, thus dark reactions are also known as Calvin's Cycle. When scientists performed experiments with chlorella plant, they found the rate of photosynthesis increased in non-continuous supply of light and again if the temperature is raised during dark reactions, the rate increases invariably. This also proved that light reactions are photochemical reactions which involve light, and dark reactions are chemical reaction which do not involve light.


Why the rate of respiration exceeds in the dark than that in the light?

Respiration exceed in the dark better than thatin the light because when its dark it is usually cooler. This helps keep moisture. When its light it is usually hotter. The light can make things dry. For example, if you leave a glass of water out in the sun for a long time it will evaporate. If you try the same with a glass of water in the dark the water might not evaporate or will take longer to evaporte * this may not always be the case. so dont be suorised if you try and results are different


What happens when you manipulate plant growth by growing plants in the dark?

Plants do grow in the "dark." There are 2 phases to photosynthesis: a light phase and a dark phase. The dark phase does not necessarily mean it happens in the dark but it CAN occur during the dark. It is the metabolism of the compounds made during the light phase, the phase requiring sunlight, of photosynthesis. Plants held in the dark too long build up cell compounds from the normal cellular pathways and create a situation called "inhibition" in which the accumulation of the cellular metabolics, the by-product, build until it causes the cell to stop normal functioning and either dies or must alter the chemistry in a manner to move those by-products out of the cell.

Related questions

Why is the Dark Reaction sometimes called Light Independent Reaction?

Because the dark reactions are CO2 assimilation's and do not need light energy. They use the ATP and NADPH created from the light reactions to convert CO2 to carbohydrates, so this can happen in the "dark" as long as the light reactions already happened.


How are Light and Dark reaction the reverse of each other?

Light reactions require light to fix photons into Redox molecules. These are temporary, and to fix this energy for long term storage, the plants use the 'dark reactions' such as the Calvin cycle. It is sort of a misnomer, because they don't HAVE to occur in the dark, just that they don't require light.


The dark reaction phase of photosynthesis occurs even without light as long as there suffcien supply of light reaction t lo?

The light reaction makes two substances needed by the dark reaction: ATP and NAPH. As long as these two substances are available the dark reaction can continue, even in the absence of light. However when they run out more light is needed to replace them.


Can the light dependant reactions occur without the light independent reactions?

No, the light reactions occur while light is present; however, the Calvin Cycle or light-independent reactions can occur any time. The light-independent reactions require photons, or energy stored from the light reactions, to complete photosynthesis.


How long does red light blink?

In the absence of shortage of information on the red light: The red light blinks because the on off of the light is controlled by a software program.


Why is the second stage of photosynthesis called light independent reaction?

The light-independent reactions are sometimes referred to as the dark reactions, though that term may be misleading as they do not actually require darkness to proceed. The term "light-independent" is used to emphasize that the reactions occur regardless of the amount of light present as long as the proper substrate compounds are available. Even this term can be criticized, however, as the availability of substrates in plants depends on photosynthesis, so the reactions cannot be said to be entirely "light-independent." Furthermore, the term "dark reactions" may be more accurate in CAM (Crassulacean acid metabolism) plants, which only take up CO2, which is necessary for the reactions to proceed, at night.http://en.wikipedia.org/wiki/Light-independent_reaction


How the long do you leave the light on for marijuana?

12 hours of light 12 hours of dark


What is the importance of light in photosynthesis?

The equation of photosynthesis is as below:Carbon dioxide + Water ---------> Glucose + OxygenThis reaction takes place in the presence of light and chlorophyll.The process of photosynthesis is completed in two stages:-Light Reactions: When light falls on leaves, it is absorbed by the chlorophyll in the chloroplasts. The solar energy is utilized to split water into oxygen and hydrogen, this process is called photolysis, and oxygen is released during this process. As these reactions take place only in the presence light, they are called light reactions.During light reactions two compounds are formed when solar energy is converted into chemical energy, these are:NADPH (Nicotinamide Adenine Di-nucleotide Phosphate)ATP (Adenosine Tri-Phosphate)NADP already exists in the cells of the leaf. The hydrogen released on the photolysis of water molecule is accepted by this compound and it becomes reduced to form NADPH.NADP (in cell) + H (from water) ---------> NADPHThis reaction takes place in the presence of light and enzymes.The compound ADP (Adenosine Di-Phosphate) is already present in the cells of the leaf and combines with the phosphate group using light energy to form a compound called ATP.ADP + P ---------> ATPThis reaction also takes place in the presence of light and enzymes.These compounds are energy rich and are needed for the dark reactions in photosynthesis.Dark Reactions: Utilizing the energy from ATP and the hydrogen from NADPH, water combines with carbon dioxide to form carbohydrates. Thus, the solar energy is now converted into chemical energy to form glucose. Other organic compounds are further synthesized from this glucose.This stage is also completed in a series of chemical reactions with the help of enzymes . Scientists have discovered an interesting thing about these two stages: only the first requires light, and the second can occur in the dark. So we call these reactions light and dark reactions respectively. Neither light energy nor chlorophyll are required for the dark reactions.Various steps of the dark reactions were studied by a scientist named Melvin Calvin, thus dark reactions are also known as Calvin's Cycle. When scientists performed experiments with chlorella plant, they found the rate of photosynthesis increased in non-continuous supply of light and again if the temperature is raised during dark reactions, the rate increases invariably. This also proved that light reactions are photochemical reactions which involve light, and dark reactions are chemical reaction which do not involve light.


What is the duration of The Long Absence?

The duration of The Long Absence is 1.42 hours.


How does the long exposure light affect the organisms that live in the dark?

It kills them


When was The Long Absence created?

The Long Absence was created on 1961-05-17.


If it takes about 8 minutes for the light from the sun to reach earth then how long would it take darkness if you totally covered the sun?

8 minutes...darkness is just the absence of light so if you cover the sun...good luck with that one...it will take 8 minutes for the last bit of light from the sun to reach earth before it can become dark hi