Question

NADPH₂ is generated through:

• A. Photosystem $-I$
• B. Photosystem $-II$
• C. Anaerobic respiration
• D. Glycolysis

Answer 1

The correct option is A

Photosystem $-I$

The correct option is A.

Explanation for the correct option:

1. In the reactions of algae, plants, and some bacteria to light, photosystem I is the second photosystem.
2. Because it was found before photosystem II, photosystem I have that name.
3. It produces NADPH_2.
4. Non-cyclic photophosphorylation involves both PS-1 and PS-II.
5. Here electrons are not cycled backwards and are used to reduce NADP to NADPH.
6. Here water is used and o and evolution take place.
7. In the reaction between plastoquinone and cytochrome f, one ATP molecule is created.
8. While cyclic photophosphorylation involves only PS-I.
9. Here the electrons of P-700 are recycled on P-700.
10. Water is not used here and evolution does not take place.
11. It involves the production of two ATP molecules, which do not produce NADPH₂.
12. As a result, both PS-I and PS-II synthesize ATP.

Explanation for the incorrect option:

Option B:

1. Photosystem II is a membrane protein super complex that carries out the initial reaction of photosynthesis in higher plants, algae, and cyanobacteria.

Option C:

1. Without oxygen, anaerobic respiration occurs and produces less energy but does it more quickly.
2. Fermentation refers to anaerobic respiration in microorganisms.
3. The products of anaerobic respiration are water, carbon dioxide, and lactic acid.

Option D:

1. The process by which glucose is broken down to provide energy is known as glycolysis.
2. It generates two pyruvate molecules, ATP, NADH, and water.
3. There is no need for oxygen throughout the process, which occurs in the cytoplasm of a cell.
4. Both aerobic and anaerobic creatures experience it.

Final answer: NADPH₂ is generated through Photosystem $-I$.