Photosynthesis in Higher Plants Chapter-Wise Test 11

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the role of PEP carboxylase in C₄ plants?

Fixes CO₂ in mesophyll cells
Reduces NADP⁺
Synthesizes ATP
Breaks down malate
1

PEP carboxylase in C₄ plants fixes CO₂ into oxaloacetic acid (OAA) in the mesophyll cells, preventing photorespiration.

What is the role of ATP and NADPH in the Calvin cycle?

ATP provides energy, and NADPH provides reducing power
Both are used for carbon fixation
Both help in the release of oxygen
ATP reduces NADP⁺
1

ATP provides the energy required, and NADPH supplies reducing power for CO₂ fixation in the Calvin cycle.

Which of the following is a product of the Calvin cycle?

NADPH
Oxygen
G3P (Glyceraldehyde-3-phosphate)
Water
3

The Calvin cycle produces G3P, which is later used to form glucose and other carbohydrates.

Which of the following statements about RuBisCO is correct?

It is found only in C₄ plants
It catalyzes both carboxylation and oxygenation
It functions only in the light-dependent reactions
It directly generates ATP
2

RuBisCO catalyzes both carboxylation (CO₂ fixation) and oxygenation (photorespiration) in C₃ plants.

Which of the following is an incorrect statement about the Calvin cycle?

It takes place in the stroma.
RuBP captures carbon dioxide.
It produces glucose directly.
ATP and NADPH are required for the cycle.
3

The Calvin cycle does not produce glucose directly; it produces G3P, which is later converted to glucose.

Which of the following statements about CAM plants is true?

They fix CO₂ at night and perform the Calvin cycle during the day
They lack RuBisCO
They have the same photosynthetic pathway as C₄ plants
They perform photosynthesis only in mesophyll cells
1

CAM plants fix CO₂ at night as organic acids and perform the Calvin cycle during the day when stomata are closed.

Which of the following correctly describes the role of ATP synthase in photosynthesis?

It captures carbon dioxide.
It breaks down glucose into pyruvate.
It synthesizes ATP using a proton gradient.
It reduces NADP+ to NADPH.
3

ATP synthase uses the proton gradient created in the thylakoid membrane to produce ATP.

Which of the following statements about the light-harvesting complex (LHC) is correct?

LHC consists only of chlorophyll a molecules.
LHC captures and transfers light energy to reaction centers.
LHC directly participates in carbon fixation.
LHC functions only during the Calvin cycle.
2

LHC captures light energy and transfers it to the reaction center for photosynthesis.

Which product of the light-dependent reactions is directly used in the Calvin cycle?

Oxygen
NADPH
Water
ATP synthase
2

NADPH provides the reducing power required to convert carbon dioxide into glucose in the Calvin cycle.

What is the main function of NADP+ in photosynthesis?

Captures light energy
Acts as the final electron acceptor in the light reactions
Fixes carbon dioxide in the Calvin cycle
Synthesizes ATP
2

NADP+ accepts electrons and hydrogen to form NADPH, used in the Calvin cycle.

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