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. RuBisCO is a bifunctional enzyme
2. In C4 plants, the site of RuBisCO activity is mesophyll cell
3. The substrate molecule for RuBisCO activity is a 5-carbon compound
4. RuBisCO action requires ATP and NADPH 

Subtopic:  C4 Cycle (Hatch & Slack Pathway) |
 78%
From NCERT
NEET - 2020
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The first stable product of CO2 fixation in sorghum is:

1. Succinic acid

2. Phosphoglyceric acid

3. Pyruvic acid

4. Oxaloacetic acid

Subtopic:  C4 Cycle (Hatch & Slack Pathway) | C4 Plants Examples |
 79%
From NCERT
NEET - 2021
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Which of the following statements is incorrect?

1. Grana lamellae have both PS I 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 |
 80%
From NCERT
NEET - 2021
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The oxygenation activity of RuBisCo enzyme in photorespiration leads to the formation of:

1. 1 molecule of the 3-C compound
2. 1 molecule of the 6-C compound
3. 1 molecule of a 4-C compound and 1 molecule of the 2-C compound
4. 2 molecules of the 3-C compound
Subtopic:  Photorespiration |
From NCERT
NEET - 2020
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In light reaction, plastoquinone facilitates the transfer of electrons from:

1. Cytb6f complex to PS I 2. PS I to NADP+
3. PS I to ATP synthase 4. PS II to Cytb6f complex
Subtopic:  Light Reactions :1 | Light Reactions |
 66%
NEET - 2020
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Which one of the following is not true regarding the release of energy during ATP synthesis through chemiosmosis?
It involves: 
1. Reduction of NADP to NADPH2 on the stroma side of the membrane 
2. Breakdown of proton gradient 
3. Breakdown of electron gradient 
4. Movement of protons across the membrane to the stroma 
Subtopic:  Chemiosmotic hypothesis |
 73%
From NCERT
NEET - 2022
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Given below are two statements: 
Statement I: The primary \(CO_2\) acceptor in \(C_4\) plants is phosphoenolpyruvate and is found in the mesophyll cells. 
Statement II: Mesophyll cells in \(C_4\) plants lack RuBisCO enzyme.
In the light of the above statements, choose the correct answer from the options given below : 
1. Statement I is incorrect but Statement II is correct.
2. Both Statement I and Statement II are correct.
3. Both Statement I and Statement II  are incorrect.
4. Statement I is correct but Statement II is incorrect.
Subtopic:  C4 Cycle (Hatch & Slack Pathway) |
 81%
From NCERT
NEET - 2022
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"Girdling Experiment" was performed by Plant Physiologists to identify the plant tissue through which:
1. osmosis is observed
2. water is transported
3. food is transported
4. for both water and food transportation
Subtopic:  Historical View: Experiments |
 62%
NEET - 2022
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What is the role of large bundle sheath cells found around the vascular bundles in C4 plants?

1. To protect the vascular tissue from high light intensity.
2. To provide the site for photorespiratory pathway.
3. To increase the number of chloroplast for the operation of Calvin cycle.
4. To enable the plant to tolerate high temperature.
Subtopic:  Question on C4 Pathway |
NEET - 2022
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