NEET-UG Biology · Class 11
Light reaction, photosystems and photophosphorylation — NEET & JEE Questions
Light reaction, photosystems and photophosphorylation is a topic in Photosynthesis in Higher Plants, a Class 11 Biology chapter of the NEET-UG syllabus. TestBudy holds 12 published NEET-UG questions on Light reaction, photosystems and photophosphorylation, each with the marking scheme of the real paper.
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Light reaction, photosystems and photophosphorylation MCQs with solutions
10 of the 12 published questions on this topic, exactly as they appear in a test. Answers and worked solutions come with your result rather than on this page.
What is the reaction-centre chlorophyll of Photosystem II called?
- A. P700, the reaction centre of Photosystem I
- B. P600
- C. P680
- D. P450
What is the immediate purpose of photolysis of water during the light reaction?
- A. To regenerate PEP in C4 plants
- B. To supply carbon dioxide for the Calvin cycle
- C. To produce glucose directly
- D. Replacement electrons for Photosystem II
How does cyclic photophosphorylation differ from non-cyclic photophosphorylation?
- A. Photosystem I only; ATP but no NADPH or oxygen
- B. It involves only Photosystem II and produces NADPH
- C. It produces oxygen but no ATP
- D. It requires both photosystems and splits water
The light reactions of photosynthesis take place mainly in the
- A. thylakoid membranes
- B. chloroplast stroma only
- C. mitochondrial matrix
- D. nucleus
Which out of the following statements is incorrect?
- A. Grana lamellae have both PS I and PS II
- B. Cyclic photophosphorylation involves both PS I and PS II
- C. Both ATP and NADPH + H are synthesised during non-cyclic photophosphorylation.
- D. Stroma lamellae lack PS II and NADP reductase
The reaction centre in PS II has an absorption maxima at
- A. 700 nm
- B. 660 nm
- C. 780 nm
- D. 680 nm
A chloroplast preparation is illuminated, but Photosystem II is selectively blocked while Photosystem I remains functional. Which process could still occur?
- A. Non-cyclic electron flow from water to NADP+
- B. Cyclic photophosphorylation
- C. Photolysis of water coupled to oxygen evolution
- D. Normal production of both ATP and NADPH through linear flow
In light reaction, plastoquinone facilitates the transfer of electrons from
- A. PS-I to ATP synthase
- B. Cytb 6 f complex to PS-I
- C. PS-I to NADP +
- D. PS-II to Cytb 6 f complex
During non-cyclic electron flow, an electron originating from water eventually reduces NADP+. Which sequence best represents its path?
- A. NADP+ → Photosystem II → water → Photosystem I
- B. Water → Photosystem I → Photosystem II → NADP+
- C. H2O → PSII → carriers → PSI → NADP+
- D. Water → Calvin cycle → Photosystem I → NADP+
In non-cyclic photophosphorylation, the electrons lost by photosystem II are ultimately replaced by electrons derived from
- A. water
- B. carbon dioxide
- C. glucose
- D. NADPH
Common mistakes in Light reaction, photosystems and photophosphorylation
Recorded against questions in this topic that are not shown above, so none of these points at an answer you can see on this page.
- Assuming electron transport and ATP synthesis are the same process rather than coupled processes.
- Assumes all photophosphorylation pathways release oxygen and reduce NADP+.
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