How many carbon atoms does the primary carbon dioxide acceptor have in C3  photosynthesis?

1. 2 2. 3
3. 4 4. 5

Subtopic:  Dark Reaction : Calvin Cycle |
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How many ATP and NADPH are respectively required to make one molecule of glucose through the Calvin pathway?

1. 3 and 2 2. 6 and 6
3. 9 and 6 4. 18 and 12
Subtopic:  Dark Reaction : Calvin Cycle |
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Identify the incorrect statement regarding the comparison of C4 plants to the C3 plants:
1. They tolerate higher temperatures
2. They show a response to high light intensities
3. They have a lower productivity of biomass
4. They lack photorespiration

Subtopic:  C4 Cycle (Hatch & Slack Pathway) |
 81%
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The bundle sheath cells are characterized by:

I: a large number of chloroplasts present in them
II: thick cell walls impervious to gas exchange
III: large intercellular spaces

1. Only I and II 2. Only I and III
3. Only II and III 4. I, II and III
Subtopic:  Question on C4 Pathway |
 72%
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The primary CO2 acceptor in C4 plants is:
1. RuBP in mesophyll cells
2. RuBP in bundle sheath cells
3. PEP in mesophyll cells
4. PEP in bundle sheath cells

Subtopic:  C4 Cycle (Hatch & Slack Pathway) |
 83%
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The C3 pathway:
1. is common to all plants
2. takes place in mesophyll cells in C4 plants
3. takes place in bundle sheath cells in C3 plants
4. does not take place in CAM plants

Subtopic:  Dark Reaction : Calvin Cycle |
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In C4 pathway, the 4-carbon compound transported to bundle sheath cells most commonly is:

1. Glutamic acid 2. Malic acid
3. Oxaloacetic acid 4. Fumaric acid
Subtopic:  C4 Cycle (Hatch & Slack Pathway) |
 72%
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The most common enzyme in the world is:

1. PEP carboxylase 2. Pyruvate dehydrogenase
3. RuBisCO 4. Collagenase
Subtopic:  Dark Reaction : Calvin Cycle |
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The 2-carbon compound formed in photorespiration is:

1. Acetyl CoA 2. Phosphoglycolate
3. Acetic acid 4. Ethanol
Subtopic:  Photorespiration |
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Photorespiration is a wasteful process. Why is it so?

1. The number of ATP molecules produced in the pathway is very low.
2. The number of NADPH molecules produced in the pathway is very low.
3. The synthesis of sugars in the pathway requires a large input of ATP energy.
4. There is neither synthesis of sugars, nor of ATP in the pathway.
Subtopic:  Photorespiration |
 87%
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