Question

The assimilatory power in photosynthesis is

• A. CO₂
• B. ATP
• C. NADPH
• D. ATP and NADPH₂

Answer 1

The correct option is D

ATP and NADPH₂

The correct option is D:

Explanation of correct option:

1. Molecular entities that provide the energy requirement for CO₂ assimilation during dark reactions in synthesis are called assimilatory powers.
2. ATP and NADPH₂ are generated with the evolution of oxygen and photolysis of water by the chemiosmotic hypothesis.
3. Both ATP and NADPH₂ help in CO₂ fixation during photosynthesis.

Explanation of the incorrect options:

Option A:

1. CO₂ is fixed during the process of photosynthesis.
2. CO₂ fixation help in glucose production.

Option B:

1. ATP is one of the assimilatory powers in photosynthesis.
2. It is produced during the photolysis of water creating a concentration gradient of H⁺ inside the thylakoid lumen.

Option C:

1. NADPH₂ is another assimilatory power in photosynthesis.
2. It is formed by the FNR complex located on the outside of the outer thylakoid membrane.

Final answer: The assimilatory power in photosynthesis is ATP and NADPH₂.