Photosynthesis in Higher Plants Chapter-Wise Test 14

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which factor affects the opening and closing of stomata, influencing photosynthesis?

Oxygen concentration
Temperature
Water availability
Chlorophyll content
3

Water availability affects stomatal opening, which in turn regulates gas exchange for photosynthesis.

Which step of the Calvin cycle requires both ATP and NADPH?

Carboxylation
Reduction
Regeneration
Oxygenation
2

During the reduction phase of the Calvin cycle, ATP provides energy, and NADPH provides electrons to convert PGA into G3P.

Which of the following statements about CAM plants is correct?

They open their stomata during the day.
They store CO2 as organic acids at night.
They do not undergo the Calvin cycle.
They grow best in humid conditions.
2

CAM plants store CO2 as organic acids at night to minimize water loss during the day.

Which pigment absorbs the maximum light energy for photosynthesis?

Chlorophyll a
Chlorophyll b
Carotenoids
Xanthophylls
1

Chlorophyll a is the primary pigment that absorbs light energy for photosynthesis.

Which of the following is the first stable product of the C3 cycle?

Phosphoglyceric acid (PGA)
Oxaloacetic acid (OAA)
Ribulose bisphosphate (RuBP)
Phosphoenolpyruvate (PEP)
1

The C3 cycle forms PGA, a three-carbon compound, as its first stable product.

Which enzyme captures carbon dioxide in the C4 pathway?

RuBisCO
PEP carboxylase
NADP reductase
ATP synthase
2

In the C4 pathway, PEP carboxylase captures CO2 efficiently, forming oxaloacetic acid.

Which of the following is an incorrect statement about the light-independent reactions?

They occur in the stroma of the chloroplast.
ATP and NADPH from light reactions are used.
Carbon dioxide is fixed into organic molecules.
Oxygen is released as a by-product.
4

Oxygen is released during the light-dependent reactions, not the light-independent reactions.

In CAM plants, when does carbon dioxide fixation occur?

During the day
Only in the morning
At night
Throughout the day and night
3

CAM plants fix carbon dioxide at night to minimize water loss.

In which part of the chloroplast does the Calvin cycle occur?

Thylakoid membrane
Grana
Stroma
Lumen
3

The Calvin cycle takes place in the stroma of the chloroplast, where carbon fixation occurs.

Which of the following statements about photorespiration is correct?

It enhances photosynthetic efficiency.
It occurs at high CO2 concentrations.
It involves oxygenation of RuBP by RuBisCO.
It results in the production of ATP.
3

Photorespiration occurs when RuBisCO binds oxygen to RuBP, leading to energy loss.

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