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Photosynthesis in Higher Plants — NEET Biology MCQs

30 questions written by hand against the NCERT chapter. Every wrong option is explained, not just the right one.

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10/14/6easy / medium / hard
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Sample questions from this chapter

A candle goes out in a sealed bell jar, but after a mint plant remains there for several days the candle can burn again. What did Priestley's experiment establish most directly?
  1. Plants synthesise starch only in darkness
  2. Plants restore a property of air consumed by burning ✓
  3. Chlorophyll absorbs red and blue light
  4. CO₂ is fixed by RuBisCO
Answer: B. Priestley showed that plants restore air made unsuitable by combustion or an animal. Later work identified the restored component as oxygen and the need for light.
Why not A: The experiment concerned restoration of air, not the light dependence of starch accumulation.
Why not C: Pigment absorption spectra were not measured in the bell jar.
Why not D: The biochemical carboxylating enzyme was unknown and not isolated by this setup.
A plant receives CO₂ containing labelled oxygen atoms, while its water is unlabelled. The O₂ released initially remains unlabelled. Which conclusion follows?
  1. Photosynthetic O₂ is derived from water rather than CO₂ ✓
  2. CO₂ supplies no atoms to carbohydrate
  3. Water is reduced to glucose directly
  4. Oxygen evolution occurs in the Calvin cycle
Answer: A. Isotope tracing shows that evolved oxygen comes from water. The tempting CO₂ answer follows the overall equation but ignores which reactant supplies the released molecule.
Why not B: CO₂ contributes carbon and oxygen to carbohydrate even though it is not the source of evolved O₂.
Why not C: Water donates electrons during light reactions; it is not converted directly into glucose.
Why not D: O₂ evolves during photolysis associated with PSII, not stromal carbon fixation.
PSII transfers electrons normally to its acceptor, but the oxygen-evolving complex is disabled. What eventually stops PSII turnover?
  1. NADP⁺ can no longer enter chloroplasts
  2. RuBP becomes the electron donor
  3. PSI begins splitting CO₂
  4. P680⁺ cannot be re-reduced by electrons from water ✓
Answer: D. Water oxidation supplies electrons that reduce P680⁺ after excitation. Without it, PSII reaction centres remain oxidised and oxygen evolution ceases.
Why not A: NADP⁺ availability affects the terminal side of linear flow, not replacement of PSII electrons.
Why not B: RuBP accepts CO₂ in the Calvin cycle and does not donate electrons to P680.
Why not C: PSI neither splits CO₂ nor replaces PSII's water-oxidation machinery.

These are 3 of the 30 questions in the test. Take the full chapter test →

Read the chapter first

Every NCERT question in this chapter is solved, free: NCERT solutions — Photosynthesis in Higher Plants →

Other NEET Biology chapters

The Living WorldBiological ClassificationPlant KingdomAnimal KingdomMorphology of Flowering PlantsAnatomy of Flowering Plants

All 32 chapters →

Questions

How many NEET questions are there on Photosynthesis in Higher Plants?

This chapter test has 30 questions — 10 easy, 14 medium and 6 hard — all written against the NCERT Class 11 chapter.

Is this NEET Biology chapter test free?

Yes. Every chapter test is free with no login. The only paid thing on the site is the full-length 90-question Biology mock and its all-India rank.

Do the questions explain the wrong options?

Yes — every distractor carries its own explanation naming the specific misconception that makes a student pick it. That is the part most question banks skip, and it is the part that changes your next attempt.