Photosynthesis in Higher Plants Chapter-Wise Test 8

Correct answer Carries: 4.

Wrong Answer Carries: -1.

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

Oxygen
ATP
NADP⁺
Water
3

In the light-dependent reactions, NADP⁺ accepts electrons at the end of the electron transport chain, forming NADPH.

Which molecule acts as the final electron acceptor in non-cyclic electron transport?

Plastoquinone
Ferredoxin
NADP⁺
ATP
3

NADP⁺ is the final electron acceptor in non-cyclic electron transport, where it is reduced to NADPH.

Which compound is reduced during the light-dependent reactions of photosynthesis?

NADP⁺
RuBP
ADP
PGA
1

NADP⁺ is reduced to NADPH during the light-dependent reactions of photosynthesis.

Which of the following is a correct statement about cyclic photophosphorylation?

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.

What happens during the regeneration phase of the Calvin cycle?

RuBP is synthesized
ATP and NADPH are used to fix CO₂
Oxygen is released
Glucose is formed
1

During the regeneration phase, RuBP is regenerated using ATP, allowing the Calvin cycle to continue.

Which enzyme catalyzes the fixation of carbon dioxide in the Calvin cycle?

ATP synthase
RuBisCO
PEP carboxylase
NADP reductase
2

RuBisCO catalyzes the first step of carbon fixation in the Calvin cycle.

Which of the following statements about the C3 cycle is incorrect?

It takes place in the stroma of chloroplasts.
3-PGA is the first stable product.
It requires ATP and NADPH.
Carbon fixation occurs in bundle sheath cells.
4

In the C3 cycle, carbon fixation occurs in mesophyll cells, not in bundle sheath cells.

Which of the following statements about CAM plants is incorrect?

They open their stomata at night.
They store CO2 as organic acids.
They perform the Calvin cycle during the day.
They fix CO2 and release O2 at night.
4

CAM plants fix CO2 at night and release oxygen during the day, not at night.

What is the primary purpose of photorespiration in C₃ plants?

Generate ATP
Increase glucose synthesis
Recycle oxygen
It has no known beneficial role
4

Photorespiration reduces photosynthetic efficiency and does not generate ATP or glucose; its biological function remains unclear.

Which part of the chloroplast contains the enzyme RuBisCO?

Thylakoid membrane
Stroma
Grana
Lumen
2

RuBisCO is located in the stroma of the chloroplast, where it catalyzes carbon fixation in the Calvin cycle.

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