Photosynthesis in Higher Plants Chapter-Wise Test 12

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which enzyme catalyzes the first step of the Calvin cycle?

RuBisCO
ATP synthase
PEP carboxylase
NADP reductase
1

RuBisCO catalyzes the first step of the Calvin cycle, fixing CO₂ to RuBP.

Which of the following statements about cyclic photophosphorylation is correct?

It involves both Photosystem I and II.
It produces both ATP and NADPH.
Electrons return to Photosystem I after energy transfer.
Oxygen is released during this process.
3

In cyclic photophosphorylation, electrons cycle back to Photosystem I, producing ATP but no NADPH or oxygen.

How many turns of the Calvin cycle are required to produce one molecule of glucose?

1
3
6
12
3

Six turns of the Calvin cycle are needed to fix six molecules of CO₂ and produce one molecule of glucose.

Which of the following molecules acts as an electron acceptor in the light reaction?

RuBP
NADP+
ATP
PEP
2

NADP+ acts as the final electron acceptor, forming NADPH in the light reactions.

Which of the following statements about the light-dependent reactions is correct?

They occur in the stroma.
NADH is produced.
Water is split, releasing oxygen.
Carbon dioxide is fixed.
3

During the light-dependent reactions, water undergoes photolysis, releasing oxygen and providing electrons.

Which of the following is NOT a product of the light-dependent reactions?

Oxygen
ATP
NADPH
Glucose
4

Glucose is produced in the Calvin cycle, not the light-dependent reactions.

Which pigment plays an accessory role in photosynthesis by transferring energy to chlorophyll a?

Chlorophyll a
Chlorophyll b
RuBisCO
NADP reductase
2

Chlorophyll b is an accessory pigment that absorbs light and transfers energy to chlorophyll a.

Which enzyme is responsible for the carboxylation of RuBP in the Calvin cycle?

PEP carboxylase
ATP synthase
RuBisCO
NADP reductase
3

RuBisCO catalyzes the carboxylation of RuBP during the first step of the Calvin cycle.

What is the first stable product formed in the Calvin cycle?

RuBP
3-PGA (3-phosphoglyceric acid)
G3P (Glyceraldehyde-3-phosphate)
Oxaloacetic acid
2

3-PGA is the first stable product of carbon fixation in the Calvin cycle.

What is the primary role of cyclic photophosphorylation?

To produce ATP
To produce NADPH
To release oxygen
To split water molecules
1

Cyclic photophosphorylation produces ATP but does not generate NADPH or oxygen.

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