Question

Choose the correct answer from each of the four options given below-

Which of the statements about the dark reactions is correct?

• A. They occur in darkness
• B. They are not light-dependent
• C. They are dependent upon the product synthesized during the light reaction.
• D. All of these.

Answer 1

The correct option is C

They are dependent upon the product synthesized during the light reaction.

The correct option is C.

Explanation for the correct option:

1. The dark phase is also called the biosynthetic phase of photosynthesis or the Blackman reaction.
2. It involves the conversion of Carbon dioxide to carbohydrates.
3. It takes place in the stroma of the chloroplast as it contains the necessary enzymes for the reaction to occur.
4. This phase utilizes the ATP and NADP produced during the light phase of photosynthesis.

Explanation for the incorrect options:

Option A:

1. The dark reaction occurs during the day but is not dependent on light. It is also called the light-independent phase.
2. The dark reaction does not occur at night and can occur both in the presence and absence of light.

Option B:

1. The dark reaction can occur independently of light.
2. But they are dependent on products like NADPH and ATP from light reactions.

Final answer:

They are dependent upon the product synthesized during the light reaction is the correct statement about the dark reaction.