Question

Light is not needed by plants in which phase of photosynthesis

• A. Light reaction
• B. Dark reaction
• C. Light reaction and dark reaction
• D. Only light reaction.

Answer 1

The correct option is B

Dark reaction

The correct option is B.

Explanation for the correct option

1. Photosynthesis is the process of synthesizing food by the autotrophs by using water and carbon dioxide in the presence of sunlight.
2. There are two phases of photosynthesis: Light reaction and dark reaction.
3. The dark reaction generally occurs during the night and is light-independent.

Explanation for the incorrect options

Option A:

The light reaction involves splitting water to release oxygen and electrons by utilizing solar energy. Thus, it is a light-dependent reaction.

Option C:

1. The light reaction is the first phase of photosynthesis that occurs in the presence of light.
2. Dark reaction is the second phase of photosynthesis that does not require light.
3. Thus, only the dark reaction is light-independent.

Option D:

The light reaction cannot occur in the absence of light.

Light is not needed by plants in the dark reaction phase of photosynthesis.