Photosynthesis in Higher Plants
Test 3

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which scientist demonstrated the role of green plants in purifying air?

Joseph Priestley
T.W. Engelmann
Cornelius van Niel
Jan Ingenhousz
1

Joseph Priestley’s experiments with a bell jar, a burning candle, and a mint plant showed that plants restore oxygen in the air.

Which organelle is the site of the light-dependent reactions of photosynthesis?

Mitochondria
Cytoplasm
Chloroplast
Peroxisome
3

Light-dependent reactions of photosynthesis occur in the thylakoid membranes of the chloroplast.

Which enzyme is responsible for splitting water during photosynthesis?

RuBisCO
ATP synthase
PEP carboxylase
Oxygen-evolving complex
4

The oxygen-evolving complex (OEC) associated with PSII splits water molecules into electrons, protons, and oxygen.

Which of the following statements about the light-dependent reactions is correct?

They occur in the stroma of the chloroplast.
Oxygen is released as a by-product.
They produce glucose directly.
Carbon dioxide is fixed during this phase.
2

In the light-dependent reactions, water is split, releasing oxygen as a by-product.

Which of the following is an incorrect statement about the Calvin cycle?

It takes place in the stroma of the chloroplast.
RuBisCO plays a crucial role in carbon fixation.
ATP and NADPH produced in light reactions are used here.
It directly produces oxygen as a by-product.
4

The Calvin cycle does not release oxygen; oxygen is a product of the light reactions.

Which pigment absorbs light most efficiently for photosynthesis?

Chlorophyll a
Carotenoids
Xanthophylls
Chlorophyll b
1

Chlorophyll a is the primary pigment that absorbs light for photosynthesis.

Which of the following statements about non-cyclic photophosphorylation is correct?

It only involves Photosystem I.
It results in the production of ATP and NADPH.
It does not produce oxygen.
Electrons return to the same photosystem.
2

Non-cyclic photophosphorylation produces both ATP and NADPH, and releases oxygen.

Which enzyme catalyzes the first step of carbon fixation in the Calvin cycle?

PEP carboxylase
RuBisCO
ATP synthase
NADP reductase
2

RuBisCO (Ribulose-1,5-bisphosphate carboxylase/oxygenase) captures CO2 in the Calvin cycle.

What is the primary function of NADPH in photosynthesis?

Acts as an electron donor in the Calvin cycle
Stores light energy
Synthesizes ATP
Releases oxygen
1

NADPH provides reducing power (electrons) in the Calvin cycle for carbon fixation.

Which component of the light reaction transfers electrons to NADP⁺?

PSII
ATP synthase
PSI
Plastoquinone
3

Photosystem I transfers electrons to NADP⁺, reducing it to NADPH in the light reaction.

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