Photosynthesis in Higher Plants Chapter-Wise Test 15

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which structure in C₄ plants prevents photorespiration?

Palisade mesophyll
Bundle sheath cells
Spongy mesophyll
Guard cells
2

In C₄ plants, bundle sheath cells maintain a high CO₂ concentration around RuBisCO, preventing photorespiration.

Which factor limits the rate of photosynthesis under natural conditions?

Oxygen concentration
Glucose concentration
Carbon dioxide concentration
Chlorophyll concentration
3

CO₂ concentration is the most common limiting factor for photosynthesis under natural conditions.

Which molecule serves as the primary acceptor of CO2 in C3 plants?

PEP (Phosphoenolpyruvate)
RuBP (Ribulose-1,5-bisphosphate)
OAA (Oxaloacetic acid)
PGA (Phosphoglyceric acid)
2

In C3 plants, RuBP is the primary acceptor of CO2 during the Calvin cycle.

Which of the following is a correct statement about the role of RuBisCO?

It captures light energy for photosynthesis.
It catalyzes carbon dioxide fixation in the Calvin cycle.
It transports electrons in the light reaction.
It reduces NADP+ to NADPH.
2

RuBisCO is the key enzyme in the Calvin cycle that fixes atmospheric carbon dioxide.

Which of the following statements about the role of light in photosynthesis is correct?

Light provides carbon for glucose synthesis.
Light splits water molecules during the light reaction.
Light directly fixes carbon dioxide in the Calvin cycle.
Light helps in the transport of glucose.
2

Light energy drives photolysis of water in the light-dependent reaction, releasing oxygen and electrons.

Which pathway is used by plants such as maize and sugarcane to minimize photorespiration?

C₃ pathway
C₄ pathway
CAM pathway
Glycolysis
2

C₄ plants, such as maize and sugarcane, use the C₄ pathway to minimize photorespiration and increase CO₂ efficiency.

Which of the following is a primary function of Photosystem I?

Splitting of water molecules
Formation of NADPH
Release of oxygen
Production of glucose
2

Photosystem I helps in reducing NADP+ to NADPH during the light reactions.

Which of the following conditions favors the occurrence of photorespiration?

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

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

Which of the following statements about the Calvin cycle is correct?

It occurs in the thylakoid membrane.
RuBisCO catalyzes the first step of carbon fixation.
Oxygen is released during this cycle.
It produces ATP and NADPH.
2

RuBisCO captures carbon dioxide and catalyzes its fixation in the Calvin cycle.

Which of the following statements about photolysis of water is correct?

It occurs in the stroma of the chloroplast.
Oxygen is absorbed as a product.
It provides electrons to Photosystem II.
NADPH is released during this process.
3

Photolysis of water occurs in the thylakoid membrane and provides electrons to Photosystem II.

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