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Class XI · Biology

Photosynthesis in Higher Plants: NEET MCQ practice

411 practice questions on Photosynthesis in Higher Plants, including 26 from past NEET papers, each with an explanation. Practise them chapter by chapter in the GyaanLoop app.

411

Practice questions

288

Easy

123

Medium

0

Hard

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What Photosynthesis in Higher Plants covers

Topics in the NEET (UG) 2026–27 syllabus for this chapter.

  • Photosynthesis as a means of autotrophic nutrition; site of photosynthesis, pigments involved
  • Photochemical and biosynthetic phases of photosynthesis
  • Cyclic and non-cyclic photophosphorylation; chemiosmotic hypothesis
  • Photorespiration, C3 and C4 pathways
  • Factors affecting photosynthesis

Past NEET questions on Photosynthesis in Higher Plants

Try each one, then open the answer and explanation.

Question 1 · NEET 2025

Which of the following statements about RuBisCO is true?

  1. A.It is active only in the dark.
  2. B.It has higher affinity for oxygen than carbon dioxide.
  3. C.It is an enzyme involved in the photolysis of water.
  4. D.It catalyzes the carboxylation of RuBP.
Show answer

Answer: D. It catalyzes the carboxylation of RuBP.

I recall RuBisCO (Ribulose-1,5-bisphosphate carboxylase/oxygenase) catalyzes the first step of the Calvin cycle: carboxylation of RuBP by adding CO₂ to form a 6‑carbon intermediate. Options (A) and (B) are wrong (active in light; higher affinity for CO₂ than O₂). (C) describes photolysis of water (PSII), not RuBisCO.

Question 2 · NEET 2025

Match List-I with List-II. List-I List-II A. Chlorophyll a I. Yellow-green B. Chlorophyll b II. Yellow C. Xanthophylls III. Blue-green D. Carotenoids IV. Yellow to Yellow-orange Choose the option with all correct matches.

  1. A.A-III, B-IV, C-II, D-I
  2. B.A-III, B-I, C-II, D-IV
  3. C.A-I, B-II, C-IV, D-III
  4. D.A-I, B-IV, C-III, D-II
Show answer

Answer: B. A-III, B-I, C-II, D-IV

Recall pigment colors: chlorophyll a is blue-green, chlorophyll b is yellow-green, xanthophylls are yellow, carotenoids are yellow-orange.

Question 3 · NEET 2024

Which one of the following products diffuses out of the chloroplast during photosynthesis?

  1. A.ADP
  2. B.NADPH
  3. C.O2
  4. D.ATP
Show answer

Answer: C. O2

During photosynthesis's light reactions inside chloroplasts, water is split, releasing oxygen (O₂) as a byproduct. This O₂ diffuses out of the chloroplast and ultimately the leaf, while ADP, NADPH, and ATP are involved in internal metabolic pathways.

Question 4 · NEET 2022

The ratio of carbon dioxide fixation between C4 plants and C3 plants is :

  1. A.2 : 3
  2. B.1 : 1
  3. C.1 : 2
  4. D.2 : 1 Ans.
Show answer

Answer: D. 2 : 1 Ans.

C4 plants fix CO2 into a 4C acid first, then release it for Calvin cycle. They minimize photorespiration, leading to higher net efficiency. C3 plants lose some fixed carbon via photorespiration, so net CO2 fixation ratio favors C4. Known ratio: ~2:1 (C4:C3).

Question 5 · NEET 2022

The products of light reaction in photosynthesis are:

  1. A.ATP, NADPH, O2 and H2O
  2. B.ATP, NADPH and H2O
  3. C.ATP, NADPH and CO2
  4. D.ATP, NADPH and O2 Ans.
Show answer

Answer: D. ATP, NADPH and O2 Ans.

Light reactions occur in thylakoids, producing ATP and NADPH using light energy, and releasing O₂ as a byproduct from water splitting. Water is consumed, not produced.

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