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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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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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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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 |
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Oxygen is not produced during photosynthesis by
1. Green sulphur bacteria
2. Nostoc
3. Cycas
4. Chara

 

Subtopic:  Historical View: Experiments |
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With reference to factors affecting the rate of photosynthesis, which of the following statements is not correct?

1. Increasing atmospheric CO2 concentration up to 0.05% can enhance CO2 fixation rate

2. C3 plants respond to higher temperatures with enhanced photosynthesis while C4 plants have much lower temperature optimum

3. Tomato is a greenhouse crop which can be grown in CO2 enriched atmosphere for higher yield

4. Light saturation for CO2 fixation occurs at 10% of full sunlight

Subtopic:  Factors Affecting Photosynthesis |
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