NEET (UG)

Practice Test 1 — Photosynthesis in Higher Plants

12 questions • 18 minutes • auto-graded with full solutions

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Section A — MCQ (Single Correct)

Question 1

The light reaction of photosynthesis occurs in the:

Solution: The photochemical (light) reaction occurs on thylakoid membranes.

Question 2

The oxygen evolved in photosynthesis originates from:

Solution: O₂ comes from the photolysis of water (van Niel).

Question 3

Cyclic photophosphorylation involves only:

Solution: Cyclic photophosphorylation uses only PS I, making ATP.

Question 4

The most abundant enzyme in the world is:

Solution: RuBisCO is the most abundant enzyme.

Question 5

The first CO₂-fixation product in maize (a C4 plant) is:

Solution: C4 plants form 4-carbon OAA first.

Question 6

Kranz anatomy is associated with:

Solution: Kranz anatomy is characteristic of C4 plants.

Question 7

Photorespiration occurs in:

Solution: Photorespiration occurs in C3 plants (RuBisCO oxygenase).

Question 8

According to the chemiosmotic hypothesis, ATP is made as protons move through:

Solution: Protons flow through ATP synthase to make ATP.

Section B — Assertion & Reason

Question 9

A: The oxygen released in photosynthesis comes from water.
R: Water is split (photolysed) at Photosystem II, releasing O₂, protons and electrons.

Solution: Photolysis of water at PS II is precisely why O₂ comes from water — R explains A.

Question 10

A: C4 plants are more productive than C3 plants.
R: C4 plants concentrate CO₂ in bundle-sheath cells and so avoid photorespiration.

Solution: Avoiding photorespiration by concentrating CO₂ is why C4 plants are more productive — R explains A.

Question 11

A: Cyclic photophosphorylation produces NADPH.
R: It involves only Photosystem I.

Solution: A is false — cyclic photophosphorylation makes ATP only, NOT NADPH; R (PS I only) is true.

Question 12

A: Increasing light intensity will not always raise the rate of photosynthesis.
R: By Blackman's law of limiting factors, the rate is set by whichever factor is in shortest supply.

Solution: If another factor (e.g. CO₂) is limiting, more light won't help — R explains A.