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  4. Photosynthesis in Higher Plants Chapter-Wise Test 2

Photosynthesis in Higher Plants Chapter-Wise Test 2

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following is an incorrect statement about cyclic photophosphorylation?

It involves only Photosystem I.
ATP is produced.
Oxygen is released as a by-product.
Electrons return to Photosystem I.
3

In cyclic photophosphorylation, oxygen is not released because water is not split.

Which molecule acts as the primary electron donor in PSII?

NADPH
Plastocyanin
Water
Ferredoxin
3

Water acts as the primary electron donor in PSII, undergoing photolysis to release electrons.

What is the significance of Engelmann’s experiment with Cladophora and aerobic bacteria?

It showed that chlorophyll is necessary for photosynthesis
It demonstrated the wavelengths of light most effective for photosynthesis
It proved that CO₂ is used in photosynthesis
It identified oxygen as a product of photosynthesis
2

Engelmann’s experiment demonstrated that photosynthesis occurs most efficiently in red and blue light by observing the movement of aerobic bacteria toward oxygen-rich regions.

Which of the following factors does NOT directly affect the rate of photosynthesis?

Light intensity
CO₂ concentration
Oxygen concentration
Temperature
3

Oxygen concentration does not directly affect the rate of photosynthesis, though high levels can increase photorespiration in C₃ plants.

Which of the following is the first step in the Calvin cycle?

Reduction
Regeneration
Carboxylation
Phosphorylation
3

The first step of the Calvin cycle is carboxylation, where CO₂ is fixed by RuBP using the enzyme RuBisCO.

What is the main advantage of the C₄ pathway over the C₃ pathway?

Higher ATP production
More efficient CO₂ fixation in high-temperature environments
Lower energy requirement
More glucose synthesis
2

The C₄ pathway is more efficient than the C₃ pathway in hot, dry environments because it prevents photorespiration and enhances CO₂ fixation.

Which component of the electron transport chain pumps protons across the thylakoid membrane?

PSII
PSI
Cytochrome b6f complex
ATP synthase
3

The cytochrome b6f complex pumps protons across the thylakoid membrane, creating a proton gradient for ATP synthesis.

Which of the following molecules is directly involved in the light-dependent reactions?

RuBP
NADP+
PGA
PEP
2

NADP+ accepts electrons and hydrogen to form NADPH in the light-dependent reactions.

Which of the following statements about the C4 pathway is correct?

Carbon fixation and the Calvin cycle occur in the same cell.
The first stable product is a three-carbon compound.
PEP carboxylase captures carbon dioxide efficiently.
It is less efficient in hot and dry conditions.
3

In the C4 pathway, PEP carboxylase efficiently captures CO2 and minimizes photorespiration.

Which of the following pigments is responsible for absorbing light energy and transferring it to chlorophyll a?

Chlorophyll b
Xanthophyll
Carotenoids
All of the above
4

Accessory pigments like chlorophyll b, xanthophylls, and carotenoids absorb light energy and transfer it to chlorophyll a for photosynthesis.

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