Photosynthesis in Higher Plants
Test 4

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which part of the chloroplast is responsible for trapping light energy?

Stroma
Grana
Thylakoid membrane
Inner membrane
3

The thylakoid membrane contains chlorophyll and other pigments responsible for capturing light energy during photosynthesis.

What is the purpose of the Kranz anatomy in C₄ plants?

Maximize light absorption
Increase CO₂ concentration around RuBisCO
Reduce transpiration
Enhance water uptake
2

Kranz anatomy ensures high CO₂ concentration around RuBisCO in the bundle sheath cells, reducing photorespiration.

Which of the following statements about the Hill reaction is correct?

It occurs in the stroma of the chloroplast.
It proves that oxygen is evolved from CO₂.
It demonstrates photolysis of water.
It requires RuBisCO as an enzyme.
3

The Hill reaction demonstrated that water is split in the presence of light, releasing oxygen.

Which of the following statements about ATP synthase is correct?

It generates ATP using a proton gradient.
It splits water molecules.
It captures carbon dioxide.
It functions only in the dark reaction.
1

ATP synthase uses a proton gradient to catalyze ATP formation during photophosphorylation.

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

It occurs in Photosystem II.
It produces oxygen as a by-product.
It releases electrons and protons.
It occurs in the stroma of the chloroplast.
4

Photolysis of water occurs in the thylakoid membrane, not in the stroma.

Which of the following conditions increases photorespiration?

Low oxygen concentration
High carbon dioxide concentration
High oxygen concentration
Low temperature
3

Photorespiration occurs when oxygen levels are high, as RuBisCO binds oxygen instead of CO₂.

Which of the following is an incorrect statement about the C3 pathway?

It produces a three-carbon compound as its first stable product.
It takes place in bundle sheath cells.
It is also known as the Calvin cycle.
RuBisCO is the key enzyme involved.
2

The C3 cycle takes place in mesophyll cells, not bundle sheath cells.

Which of the following statements about Engelmann’s experiment is correct?

It demonstrated the role of RuBisCO in carbon fixation
It showed that photosynthesis occurs at maximum rate in blue and red light
It proved that oxygen is evolved during respiration
It showed that photosynthesis is independent of light
2

Engelmann used a prism to split light and observed that aerobic bacteria clustered around areas with blue and red light, indicating high oxygen evolution and photosynthesis.

What happens when the light intensity exceeds the saturation point in photosynthesis?

Photosynthesis increases indefinitely
Chlorophyll is broken down
More ATP and NADPH are produced
Photorespiration is enhanced
2

When light intensity exceeds the saturation point, excess light can cause photodamage, leading to chlorophyll degradation.

Why is the C₄ pathway considered more efficient than the C₃ pathway?

It consumes less ATP
It produces more glucose
It minimizes photorespiration
It requires less water
3

The C₄ pathway reduces photorespiration by maintaining a high CO₂ concentration around RuBisCO, making it more efficient than the C₃ pathway.

Performance Summary

Score:

Category Details
Total Attempts:
Total Skipped:
Total Wrong Answers:
Total Correct Answers:
Time Taken:
Average Time Taken per Question:
Accuracy:
0