Photosynthesis In Higher Plants Chapter-Wise Test 1

Correct answer Carries: 4.

Wrong Answer Carries: -1.

What is the first stable product of the Calvin cycle?

Oxaloacetic acid
Phosphoenolpyruvate
3-Phosphoglyceric acid
G3P
3

3-Phosphoglyceric acid (PGA) is the first stable product formed in the Calvin cycle.

Which of the following conditions promotes the C4 pathway in plants?

Low light intensity
Cool and humid environment
High oxygen concentration
Hot and dry environment
4

The C4 pathway helps plants avoid photorespiration in hot, dry environments.

Which enzyme in C₄ plants releases CO₂ in bundle sheath cells?

PEP carboxylase
RuBisCO
Malic enzyme
ATP synthase
3

Malic enzyme releases CO₂ from malate in bundle sheath cells, providing high CO₂ concentration for RuBisCO.

What is the primary function of light-harvesting complexes in photosynthesis?

Capture and transfer light energy to reaction centers
Synthesize ATP directly
Fix CO₂ into carbohydrates
Transport electrons to NADP⁺
1

Light-harvesting complexes absorb light and transfer energy to reaction centers for photosynthesis.

Which of the following is a direct product of the Calvin cycle?

Glucose
ATP
NADPH
G3P (Glyceraldehyde-3-phosphate)
4

G3P (Glyceraldehyde-3-phosphate) is the direct product of the Calvin cycle, which can be used to form glucose and other carbohydrates.

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

Electrons flow from NADPH to water.
It involves both Photosystem I and II.
It does not generate ATP.
Oxygen is not released in this process.
2

The Z-scheme describes the linear flow of electrons from water to NADP+ through Photosystem II and I.

Which of the following statements is true about the Z scheme of photosynthesis?

It involves only Photosystem I
It represents the movement of electrons from water to NADP⁺
It occurs in the stroma
It does not involve the splitting of water
2

The Z scheme represents the movement of electrons from water to NADP⁺ through Photosystem II and Photosystem I.

What happens to protons (H⁺) during ATP synthesis in photosynthesis?

They are pumped into the stroma
They move from the stroma to the lumen
They pass through ATP synthase into the stroma
They are used to reduce NADP⁺
3

Protons move through ATP synthase from the lumen to the stroma, generating ATP through chemiosmosis.

Which of the following is a major advantage of C4 photosynthesis over C3 photosynthesis?

C4 plants have lower water-use efficiency.
C4 plants minimize photorespiration.
C4 plants do not need RuBisCO.
C4 plants perform photosynthesis without ATP.
2

C4 plants reduce photorespiration by using PEP carboxylase to fix CO₂ in mesophyll cells.

Which of the following statements about photorespiration is correct?

It increases photosynthetic efficiency.
It releases carbon dioxide and uses ATP.
It occurs only in C4 plants.
It takes place under low oxygen concentrations.
2

Photorespiration results in CO2 release and ATP consumption, reducing photosynthetic efficiency.

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