Photorespiration — Photosynthesis in higher plants NEET Questions 2026

Sample Questions — Photorespiration

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MCQ

Select the correct statements about photorespiration: I. It uses ATP and NADPH II. It results in loss of previously fixed carbon III. It consumes O₂ IV. It involves mitochondria

A. I, II, IV
B. II, III, IV
C. I, III, IV
D. All of the above

✅ Correct Answer: B

ATP/NADPH are not produced or used; O₂ is consumed and carbon is lost.

MCQ

Why does photorespiration not produce glucose?

A. Because CO₂ is not fixed
B. Because PEPCO cannot reduce CO₂
C. Because the Calvin cycle is replaced with another process
D. Because it breaks down phosphoglycolate instead of forming G3P

✅ Correct Answer: D

No carbohydrate biosynthesis occurs; fixed carbon is lost.

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MCQ

Why is it important for plants to avoid photorespiration in hot climates?

A. To reduce O₂ availability
B. Because high light and heat increase transpiration
C. Because photorespiration leads to energy and carbon loss
D. Because Calvin cycle is deactivated at high temperature

✅ Correct Answer: C

It reduces overall photosynthetic efficiency, which is critical under stress.

MCQ

Why does photorespiration increase at higher temperatures?

A. RuBisCO becomes inactive because it gets denatured at higher temperatures
B. PEPCO replaces RuBisCO
C. Oxygen competes more effectively with CO₂
D. Calvin cycle shuts down

✅ Correct Answer: C

At high temperatures, the affinity of RuBisCO for O₂ increases, leading to more photorespiration.

MCQ

Why is photorespiration considered a wasteful process?

A. It uses up ATP and NADPH
B. It synthesizes amino acids instead of glucose
C. It releases oxygen instead of using it for respiration
D.It leads to the loss of previously fixed carbon and no ATP is formed

✅ Correct Answer: D

CO₂ is released without gaining useful products like glucose, ATP, or NADPH.

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Photorespiration — NEET Biology Questions

Sample Questions — Photorespiration

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