Photosynthesis in Higher Plants Chapter-Wise Test 7

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which of the following occurs only in the bundle sheath cells of C₄ plants?

Photorespiration
Calvin cycle
C₄ pathway
Light reaction
2

In C₄ plants, the Calvin cycle occurs exclusively in the bundle sheath cells, while the C₄ pathway takes place in mesophyll cells.

Which of the following statements about Photosystem II (PSII) is correct?

PSII absorbs light at a wavelength of 700 nm.
PSII is responsible for photolysis of water.
PSII transfers electrons directly to NADP+.
Oxygen is not produced in PSII.
2

PSII absorbs light at 680 nm and drives the splitting of water, releasing oxygen and electrons.

Which molecule provides reducing power for the Calvin cycle?

NADPH
NADH
FADH2
ATP
1

NADPH provides the reducing power needed to convert carbon dioxide into glucose during the Calvin cycle.

Which of the following conditions favors photorespiration?

High carbon dioxide concentration
Low temperature
High oxygen concentration
Abundant water supply
3

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

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

It involves both Photosystem I and Photosystem II.
Electrons move in a linear path from water to NADP+.
Oxygen is released as a by-product.
Electrons return to Photosystem II after excitation.
4

In the Z-scheme, electrons do not return to Photosystem II; they move to NADP+, reducing it to NADPH.

Which molecule acts as the primary CO₂ acceptor in the Calvin cycle?

PGA
RuBP
PEP
OAA
2

Ribulose-1,5-bisphosphate (RuBP) is the primary acceptor of CO₂ in the Calvin cycle.

What is the function of plastoquinone in the electron transport chain?

Accepts electrons from PSII and transfers them to the cytochrome complex
Transfers electrons to NADP⁺
Carries protons across the membrane
Synthesizes ATP
1

Plastoquinone accepts electrons from PSII and transfers them to the cytochrome b6f complex in the electron transport chain.

Which process is responsible for ATP synthesis in the chloroplast?

Substrate-level phosphorylation
Oxidative phosphorylation
Photophosphorylation
Glycolysis
3

Photophosphorylation is the process of ATP synthesis in chloroplasts, driven by light energy.

What is the major function of carotenoids in photosynthesis?

Absorb green light
Transfer electrons to PSI
Prevent photo-oxidation of chlorophyll
Store energy
3

Carotenoids act as accessory pigments that protect chlorophyll from photo-oxidation by dissipating excess light energy.

Why do C₃ plants show lower productivity than C₄ plants in hot climates?

C₃ plants use more ATP
C₃ plants undergo high rates of photorespiration
C₃ plants fix CO₂ faster
C₃ plants have Kranz anatomy
2

C₃ plants have lower productivity in hot climates because they undergo high rates of photorespiration, reducing CO₂ fixation efficiency.

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