Why does darkness affect the light-independent reactions of photosynthesis?

Asked by maham237 @ 24/12/2020 in Biology viewed by 283 People

Why does darkness affect the light-independent reactions of photosynthesis?
Plants stop their daytime activities and rest during the night much like animals do.

Light independent reactions need more heat energy than nighttime temperatures often provide.

Mitochondria produce sugars more effectively in the darkness than chloroplasts do.

Light independent reactions require the energy gathered in the thylakoids.

Answered by maham237 @ 24/12/2020

Answer:

The correct answer would be Light independent reactions require the energy gathered in the thylakoids.

Photosynthesis can divided into two sub-processes or reactions:

Light-dependent reaction: It converts solar energy into chemical energy that is, ATP (adenosine triphosphate) and NADPH with the help of photolysisis of water. It takes place in thyllakoid membrane of the chloroplast.

Light-independent reaction: It fixes carbon obtained from carbon dioxide into the food or glucose with the help of enzyme RuBisCO (Ribulose-1,5-bisphosphate carboxylase/oxygenase).

It takes place in the stroma of the chloroplast and does not require the involvement of light however, it requires the products (ATP and NADPH) of the light reaction.

Fixation of 1 molecule of glucose requires 6 molecules of carbon dioxide, 9 molecules of ATP and 6 molecules of NADPH.

So, darkness indirectly affects the light-independent reaction.

Why does darkness affect the light-independent reactions of photosynthesis?

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