Consider the situation where photosynthesis is going on at a steady pace in a typical experiment with a light on, and carbon dioxide is being combined with ribulose-bisphosphate (RuBP) to produce 3-phosphoglycerate (3PG). Then suddenly the source of carbon dioxide is eliminated. What changes in the concentrations of 3PG and RuBP would occur?

1. 3PG levels rise, RuBP levels fall.

2. 3PG levels fall, RuBP levels rise.

3. 3PG levels rise, RuBP levels rise.

4. 3PG levels fall, RuBP levels fall.

Subtopic:  Light Reaction: Photophosphorylation |
 57%
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PGA as the first CO2 fixation was discovered in the photosynthesis of 

(1) bryophyte

(2) gymnosperm

(3) angiosperm

(4) algae

Subtopic:  Light Reaction: Electron Transport | Light Reaction: Photophosphorylation |
 67%
From NCERT
NEET - 2010
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Who discovered photophosphorylation?

(1) Arnon et. al.

(2) Von Mayer

(3) Clavin et.al.

(4) Hill

Subtopic:  Light Reaction: Photophosphorylation |
AIIMS - 2001
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Hill reaction occurs in:

(1) high altitude plants

(2) total darkness

(3) absence of water

(4) presence of ferricyanide

Subtopic:  Light Reaction: Photophosphorylation |
AIIMS - 2003
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Which of the following is not a product of light reaction of photosynthesis?
1. ATP 2. NADH
3. NADPH 4. Oxygen
Subtopic:  Light Reaction: Photophosphorylation |
 73%
From NCERT
NEET - 2018
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Cyclic -photophosphorylation results in the formation of:
1. NADPH
2. ATP and NADPH
3. ATP, NADPH, and O2
4. ATP

Subtopic:  Light Reaction: Photophosphorylation |
 78%
From NCERT
AIPMT - 2009
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During non-cyclic photophosphorylation, when electrons are lost from the reaction center at PS II, what is the source which replaces these electrons?

1. Oxygen 2. Water
3. Carbon dioxide 4. Light 
Subtopic:  Light Reaction: Photophosphorylation |
 82%
From NCERT
NEET - 2020
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Which of the following statements is incorrect?

1. Grana lamellae have both PSI and PS II.
2. Cyclic photophosphorylation involves both PS I and PS II.
3. Both ATP and NADPH+H+ are non-cyclic synthesized during photophosphorylation.
4. Stroma lamellae have PS I only and lack NADP reductase.

Subtopic:  Light Reaction: Photophosphorylation |
 79%
From NCERT
NEET - 2021
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What would be true for the events shown in the given diagram?
I:  A possible location where this could be happening is in the stroma lamellae.
II: While the membrane or lamellae of the grana have both PS I and PS II, the stroma lamellae membranes lack PS II as well as NADP reductase enzyme.
 
1. Only I 2. Only II
3. Both I and II 4. Neither I nor II
Subtopic:  Light Reaction: Photophosphorylation |
 85%
From NCERT
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Assertion(A): RuBisCO has affinity for both the gases: CO2 and O2.
Reason(R): RuBisCO is the most abundant enzyme in the biosphere.
Choices for Assertions and reasons:
1. Both (A) and (R) are true and (R) is the correct explanation of (A).
2. Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3. (A) is true, but (R) is false.
4. (A) is false, but (R) is true.
Subtopic:  Light Reaction: Photophosphorylation |
 81%
From NCERT
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