In Hatch and Slack pathway, the primary CO2 acceptor is -

1. Oxaloacetic acid

2. Phosphoglyceric acid

3. Phosphoenol pyruvate

4. Rubisco

Subtopic:  C4 Cycle (Hatch & Slack Pathway) |
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One scientist cultured Cladophora in a suspension of Azotobacter and illuminated the culture by splitting light through a prism. He observed that bacteria accumulated mainly in the region of :

1. Violet and green light

2. Indigo and green light

3. Orange and yellow light

4. Blue and red light

Subtopic:  Historical View: Experiments |
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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 |
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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 |
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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 |
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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 Plants Examples | Question on C4 Pathway |
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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 |
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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 |
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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 |
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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) |
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