Photosynthesis in Higher Plants
Test 5

Correct answer Carries: 4.

Wrong Answer Carries: -1.

Which pigment is directly involved in the conversion of light energy to chemical energy in photosynthesis?

Chlorophyll a
Chlorophyll b
Carotenoids
Xanthophylls
1

Chlorophyll a is the primary pigment that directly participates in the photochemical reactions of photosynthesis.

Which scientist discovered the role of oxygen release during photosynthesis?

Joseph Priestley
Jan Ingenhousz
Melvin Calvin
Julius von Sachs
2

Jan Ingenhousz demonstrated that green plants release oxygen in the presence of sunlight.

Which of the following statements about photosynthesis is correct?

Green plants are heterotrophs.
Photosynthesis is responsible for the release of oxygen into the atmosphere.
Carbon dioxide is not required for photosynthesis.
Photosynthesis only occurs in non-green parts of plants.
2

Photosynthesis is essential for the release of oxygen into the atmosphere, making green plants autotrophs.

Which of the following is an early experiment that established the role of green plants in oxygen production?

Jan Ingenhousz’s experiment with an aquatic plant.
Mendel’s experiments on pea plants.
Darwin’s theory of evolution.
Sachs' discovery of glucose in plants.
1

Jan Ingenhousz demonstrated that only green parts of plants release oxygen in sunlight.

Which of the following is NOT a requirement for photosynthesis?

Chlorophyll
Light
Carbon Dioxide
Nitrogen
4

Nitrogen is not directly involved in photosynthesis; CO2, light, and chlorophyll are essential.

Which statement about Calvin's work on photosynthesis is correct?

He discovered the oxygen release from water splitting.
He mapped the pathway of carbon assimilation in photosynthesis.
He identified chlorophyll’s role in oxygen production.
He explained the role of nitrogen in photosynthesis.
2

Melvin Calvin mapped the pathway of carbon assimilation, earning him the Nobel Prize.

Which of the following pigments is most abundant and crucial for photosynthesis?

Chlorophyll a
Chlorophyll b
Carotenoids
Xanthophylls
1

Chlorophyll a is the primary pigment directly involved in the light reactions of photosynthesis.

Which of the following is the first stable product formed in C₃ plants during carbon fixation?

Phosphoenolpyruvate (PEP)
Oxaloacetic acid (OAA)
3-Phosphoglyceric acid (PGA)
Ribulose bisphosphate (RuBP)
3

In C₃ plants, CO₂ fixation leads to the formation of 3-phosphoglyceric acid (PGA) as the first stable product.

Which pathway is used by plants adapted to dry tropical climates for efficient CO₂ fixation?

C₃ pathway
C₄ pathway
Photorespiration
CAM pathway
2

The C₄ pathway allows plants to fix CO₂ efficiently in dry conditions by reducing photorespiration.

Which enzyme catalyzes the fixation of CO₂ in the Calvin cycle?

RuBisCO
PEP carboxylase
NADP reductase
ATP synthase
1

RuBisCO (Ribulose-1,5-bisphosphate carboxylase-oxygenase) catalyzes the first step of the Calvin cycle.

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