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Question: All of the following statements are true about photosynthesis, except A. The light cycle occurs o...

All of the following statements are true about photosynthesis, except
A. The light cycle occurs only during exposure to light.
B. The dark cycle occurs only in the absence of light.
C. ATP is produced during the light cycle.
D. During the dark cycle, sugars are produced.
E. Red and blue light are optimal for photosynthetic function.

Explanation

Solution

Light reaction occurs only in presence of light to produce energy which can be further used up by dark reaction. Dark reaction is independent to light. Color of light does not affect the rate of reaction. Carbohydrates are the main product of dark reaction.

Complete answer:
Photosynthesis occurs in green plants by which the solar energy is converted into chemical energy. It occurs in the chloroplast present in green leaves. Chloroplast has two photosystems to absorb specific wavelengths of light. Carbohydrates and oxygen molecules are the main products of photosynthesis.
Photosynthesis involves the light and dark reactions. Light reactions occur when the plant is exposed to light. Exposure to red and blue light also shows the same results as white light. It also shows optimal functions in the plant. Light reaction occurs in the grana of chloroplast. The main function of light reaction is to produce NADPH and ATP as the reaction product.
Dark reaction is independent of the light. It can occur both in presence and absence of light. Products of light reactions are used up by the dark reaction. The main product of dark reactions is carbohydrates.
From the above information we have found that all the statements given in the question are true, except the dark cycle occurs only in the absence of light.

So, the correct answer is option B.

Note: Chloroplasts capture the light and generate high energy electrons. These electrons are used to produce NADPH and ATP during light reaction. Calvin cycle, hatch and slack cycle and CAM are the cycles to generate carbohydrate. Dark reactions occur outside the thylakoids. Overall products of light reaction are 6 molecules of oxygen, 12 NADPH and 18 ATP molecules.