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  4. Photosynthesis in Higher Plants Chapter-Wise Test 3

Photosynthesis in Higher Plants Chapter-Wise Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which product of the light reactions is directly used in the Calvin cycle?

Oxygen
Water
NADPH
Photon
3

NADPH, produced in the light reactions, provides reducing power for CO₂ fixation in the Calvin cycle.

What is the role of the enzyme RuBisCO in photosynthesis?

Fixation of CO₂ in the Calvin cycle
Splitting of water molecules
Synthesis of ATP
Reduction of NADP⁺
1

RuBisCO (Ribulose-1,5-bisphosphate carboxylase-oxygenase) catalyzes the fixation of CO₂ in the Calvin cycle.

Which of the following is the first stable product in the C4 pathway?

3-Phosphoglyceric acid (3-PGA)
Oxaloacetic acid (OAA)
Phosphoenolpyruvate (PEP)
Ribulose bisphosphate (RuBP)
2

Oxaloacetic acid (OAA), a four-carbon compound, is the first stable product in the C4 pathway.

Which of the following conditions favors photorespiration in C₃ plants?

High CO₂ and low O₂ concentration
High O₂ and low CO₂ concentration
High light intensity and low temperature
Low light intensity and high humidity
2

Photorespiration occurs in C₃ plants when O₂ concentration is high and CO₂ concentration is low, leading RuBisCO to function as an oxygenase instead of a carboxylase.

Which of the following is an incorrect statement about Photosystem I (PSI)?

PSI absorbs light at 700 nm wavelength.
Electrons from PSI reduce NADP+ to NADPH.
Oxygen is evolved in PSI.
It participates in cyclic and non-cyclic photophosphorylation.
3

Oxygen is evolved in Photosystem II, not Photosystem I.

Which molecule acts as an electron donor in oxygenic photosynthesis?

NADPH
Water
Chlorophyll
ATP
2

In oxygenic photosynthesis, water donates electrons to PSII, leading to oxygen evolution.

What role does PEP carboxylase play in C4 plants?

Fixes carbon dioxide into a four-carbon compound
Splits water molecules
Generates ATP
Reduces NADP+
1

PEP carboxylase captures CO2 and converts it into oxaloacetic acid (OAA) in C4 plants.

Which of the following does NOT occur during the light reactions of photosynthesis?

ATP synthesis
Splitting of water
Oxygen evolution
Glucose formation
4

Glucose formation does not occur during the light reactions; it occurs in the Calvin cycle.

Which of the following statements about NADPH is correct?

It captures light energy.
It provides reducing power for the Calvin cycle.
It directly synthesizes glucose.
It splits water molecules.
2

NADPH provides the reducing power required to convert carbon dioxide into glucose in the Calvin cycle.

Which of the following statements about the light-dependent reactions of photosynthesis is correct?

They occur in the stroma of the chloroplast.
Water is split, releasing oxygen.
NADH is produced during this process.
Glucose is synthesized directly.
2

In light-dependent reactions, water undergoes photolysis, releasing oxygen, electrons, and protons.

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