Photosynthesis in Higher Plants Chapter-Wise Test 10

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Why do C₄ plants have a higher productivity compared to C₃ plants?

They lack RuBisCO
They use only cyclic photophosphorylation
They have a mechanism to minimize photorespiration
They perform photosynthesis only at night
3

C₄ plants prevent photorespiration by maintaining high CO₂ levels in the bundle sheath cells, making them more efficient.

Which of the following statements about CAM plants is correct?

They open their stomata during the day.
They store carbon dioxide as organic acids at night.
They fix carbon dioxide using RuBisCO at night.
They perform the Calvin cycle only at night.
2

CAM plants open their stomata at night and store carbon dioxide as organic acids.

Which molecule is the final electron acceptor in the light-dependent reactions of photosynthesis?

Oxygen
RuBP
NADP+
Water
3

NADP+ accepts electrons at the end of the light reactions, forming NADPH.

What is the immediate product of photolysis of water in photosynthesis?

O₂, ATP, and NADPH
O₂, protons (H⁺), and electrons
CO₂ and water
Glucose and oxygen
2

Photolysis of water in PSII produces oxygen, protons (H⁺), and electrons, which are used in the electron transport chain.

Which of the following statements about C4 plants is correct?

Carbon fixation occurs in bundle sheath cells.
The first stable product is a three-carbon compound.
PEP carboxylase efficiently captures carbon dioxide.
C4 plants are less efficient in hot and dry environments.
3

In C4 plants, PEP carboxylase captures CO2 in mesophyll cells, reducing photorespiration.

What is the role of cytochrome b6f complex in the electron transport chain?

Transfers electrons from PSII to plastocyanin
Fixes CO₂
Synthesizes ATP
Reduces NADP⁺
1

The cytochrome b6f complex transfers electrons from plastoquinone to plastocyanin and pumps protons into the thylakoid lumen.

Which of the following statements about the role of water in photosynthesis is correct?

Water acts as the primary electron donor.
Water directly fixes carbon dioxide.
Water is a product of the Calvin cycle.
Water captures light energy for the light reaction.
1

Water splits during photolysis in the light-dependent reaction, providing electrons to Photosystem II.

Which of the following statements is true about NADP reductase?

It is found in the thylakoid membrane
It reduces NADP⁺ to NADPH
It receives electrons from ferredoxin
All of the above
4

NADP reductase is located in the thylakoid membrane, receives electrons from ferredoxin, and reduces NADP⁺ to NADPH.

Which of the following wavelengths of light is least effective for photosynthesis?

Red
Blue
Green
Violet
3

Green light is least effective for photosynthesis because chlorophyll reflects most of it instead of absorbing it.

Which of the following statements about cyclic photophosphorylation is true?

It involves both Photosystem I and II.
It produces both ATP and NADPH.
It releases oxygen as a byproduct.
It only produces ATP.
4

Cyclic photophosphorylation only involves Photosystem I and results in ATP production without oxygen release.

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