Which pigment system ultimately donates e– for the reduction of NADP.a)PS IIb)PS Ic)CO2d)PlastoquinoneCorrect answer is option 'B'. Can you explain this answer?

Question

Which pigment system ultimately donates e&#8211; for the reduction of NADP.a)PS IIb)PS Ic)CO2d)PlastoquinoneCorrect answer is option 'B'. Can you explain this answer?

Answer

During non-cyclic electron flow, the electron ejected on behalf of PS I by the reaction centre P 700 moves uphill and reduces an iron-sulphur protein. From here, it moves downhill to ferredoxin (Fd) and then to NADP + , which is reduced to NADPH 2. The enzyme which actually forms reduced NADPH 2 is ferredoxin NADPH oxidoreductase.
so, the correct answer is option B.

Answer

During non-cyclic electron flow, the electron ejected on behalf of PS I by the reaction centre P 700 moves uphill and reduces an iron-sulphur protein. From here, it moves downhill to ferredoxin (Fd) and then to NADP + , which is reduced to NADPH 2. The enzyme which actually forms reduced NADPH 2 is ferredoxin NADPH oxidoreductase.
so, the correct answer is option B.

Answer

PS I (Photosystem I) is the pigment system that ultimately donates electrons for the reduction of NADP (Nicotinamide adenine dinucleotide phosphate). PS I is one of the two major pigment systems involved in photosynthesis, the other being PS II (Photosystem II).

Photosystems in Photosynthesis:
Photosynthesis is the process by which plants and some other organisms convert light energy into chemical energy in the form of glucose. This process takes place in the chloroplasts of plant cells. Photosystems are protein complexes located in the thylakoid membranes of the chloroplasts, where they play a crucial role in capturing and converting light energy.

Photosystem II (PS II):
PS II is the first photosystem involved in the light-dependent reactions of photosynthesis. It absorbs light energy and uses it to oxidize water molecules, releasing oxygen and protons. The energized electrons from PS II are then passed through an electron transport chain, generating ATP (adenosine triphosphate) through a process called photophosphorylation.

Photosystem I (PS I):
PS I is the second photosystem in the light-dependent reactions. It absorbs light energy and uses it to energize electrons. These electrons are then passed through a series of electron carriers, including a molecule called plastocyanin, to generate more ATP.

Role of PS I in NADP+ Reduction:
The final step in the light-dependent reactions is the reduction of NADP+ to NADPH. This is an essential step in photosynthesis because NADPH is a high-energy electron carrier that plays a crucial role in the synthesis of glucose during the light-independent reactions.

PS I plays a direct role in the reduction of NADP+ by donating high-energy electrons to NADP+. After receiving electrons from the electron transport chain, PS I becomes excited and transfers its electrons to a molecule called ferredoxin. Ferredoxin then transfers the electrons to an enzyme called ferredoxin-NADP+ reductase, which catalyzes the reduction of NADP+ to NADPH.

Conclusion:
In summary, PS I is the pigment system that ultimately donates electrons for the reduction of NADP+ during photosynthesis. By transferring high-energy electrons to NADP+, PS I plays a vital role in the production of NADPH, which is essential for the synthesis of glucose and other organic molecules in plants.

Top Courses for NEETView all

Daily Test for NEET Preparation

NEET Mock Test Series - Updated 2026 Pattern

Topic-wise MCQ Tests for NEET

Biology Class 11

DPP: Daily Practice Problems for NEET

Top Courses for NEET

Top Courses for NEET

Related Content

Mock Test & Practice

Main Subjects

Guided Learning

Revision

Competitive & Government Exams