Home › NEET Biology MCQs › Photosynthesis in Higher Plants
NEET · Biology · Class 11

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.

30questions
10/14/6easy / medium / hard
₹0no login
Take the Photosynthesis in Higher Plants test →
Free · your all-India rank after you finish

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, and you get your all-India rank on every one. Nothing on the site is on sale right now.

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.