Photosynthesis in Higher Plants Chapter-Wise Test 9

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is an incorrect statement about the C4 pathway?

It helps minimize photorespiration.
The first stable product is a four-carbon compound.
Carbon fixation occurs in bundle sheath cells.
PEP carboxylase plays a key role in initial CO2 fixation.
3

In C4 plants, carbon fixation occurs in mesophyll cells, while the Calvin cycle occurs in bundle sheath cells.

In the light-dependent reactions, the final electron acceptor is:

Oxygen
NADP+
Water
RuBP
2

NADP+ accepts electrons and hydrogen at the end of the light-dependent reactions to form NADPH.

Which of the following statements about the Z-scheme of electron transport is correct?

It describes the movement of electrons from Photosystem I to Photosystem II.
It does not involve ATP synthesis.
It explains the unidirectional flow of electrons in non-cyclic photophosphorylation.
It does not involve the splitting of water.
3

The Z-scheme illustrates the electron flow from water to NADP+ in non-cyclic photophosphorylation.

Which enzyme is responsible for the reduction of NADP+ in the light reactions?

RuBisCO
NADP reductase
ATP synthase
PEP carboxylase
2

NADP reductase facilitates the reduction of NADP+ to NADPH in the light-dependent reactions.

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

It only involves Photosystem I.
ATP, NADPH, and oxygen are produced.
Electrons return to the same photosystem.
It does not require sunlight.
2

Non-cyclic photophosphorylation involves both Photosystem I and II, producing ATP, NADPH, and releasing oxygen.

Which part of the chloroplast contains ATP synthase?

Stroma
Thylakoid membrane
Inner membrane
Intermembrane space
2

ATP synthase is located in the thylakoid membrane and catalyzes ATP production using a proton gradient.

Which of the following is an incorrect statement about the C4 pathway?

It minimizes photorespiration.
Oxaloacetic acid (OAA) is the first stable product.
Carbon fixation and the Calvin cycle occur in the same cell.
It is found in plants adapted to hot and dry climates.
3

In the C4 pathway, carbon fixation occurs in mesophyll cells and the Calvin cycle in bundle sheath cells.

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

Oxygen
ATP
NADPH
Glucose
4

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

What is the key adaptation of C₄ plants that helps them avoid photorespiration?

They perform photosynthesis only at night
They use PEP carboxylase for initial CO₂ fixation
They lack bundle sheath cells
They do not require ATP for CO₂ fixation
2

C₄ plants use PEP carboxylase to initially fix CO₂, reducing photorespiration by maintaining high CO₂ concentration in bundle sheath cells.

Which of the following conditions increases photorespiration?

High carbon dioxide concentration
Low oxygen concentration
High oxygen concentration
Cool and humid conditions
3

Photorespiration increases when oxygen levels are high and carbon dioxide levels are low.

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