“Photosysnthesis in Higher Plants” MCQ with Answer Explanation : NEET 2025.

MCQ 51:
What is the primary role of the thylakoid membrane in photosynthesis?

A) To store glucose
B) To synthesize ATP and NADPH
C) To absorb nutrients
D) To transport water

Answer: B) To synthesize ATP and NADPH

Explanation:
The thylakoid membranes are where the light-dependent reactions take place, leading to the synthesis of ATP and NADPH.

MCQ 52:
Which of the following plants typically exhibits Crassulacean Acid Metabolism (CAM)?

A) Wheat
B) Rice
C) Cactus
D) Soybean

Answer: C) Cactus

Explanation:
CAM plants, like cacti, open their stomata at night to minimize water loss and store carbon dioxide for use during the day.

MCQ 53:
The Calvin cycle requires which of the following inputs?

A) Carbon dioxide
B) ATP
C) NADPH
D) All of the above

Answer: D) All of the above

Explanation:
The Calvin cycle requires carbon dioxide, ATP, and NADPH to synthesize glucose from carbon dioxide.

MCQ 54:
What is the main product of the light-dependent reactions that is used in the Calvin cycle?

A) Glucose
B) Oxygen
C) ATP and NADPH
D) Carbon dioxide

Answer: C) ATP and NADPH

Explanation:
ATP and NADPH produced during the light-dependent reactions are essential for driving the reactions of the Calvin cycle.

MCQ 55:
In photosynthesis, which of the following events occurs first?

A) ATP synthesis
B) Water splitting
C) Carbon fixation
D) Oxygen release

Answer: B) Water splitting

Explanation:
The splitting of water molecules occurs early in the light-dependent reactions, providing electrons for the electron transport chain.

MCQ 56:
What do plants primarily use to transport the products of photosynthesis?

A) Xylem
B) Phloem
C) Stomata
D) Chloroplasts

Answer: B) Phloem

Explanation:
Phloem is responsible for transporting the products of photosynthesis (mainly sugars) from the leaves to other parts of the plant.

MCQ 57:
Which pigment primarily absorbs blue and red light?

A) Carotenoids
B) Chlorophyll a
C) Chlorophyll b
D) All of the above

Answer: B) Chlorophyll a

Explanation:
Chlorophyll a primarily absorbs blue and red light, making it the most effective pigment for photosynthesis.

MCQ 58:
Which of the following is a type of non-cyclic photophosphorylation?

A) Photosystem I only
B) Photosystem II only
C) Both Photosystem I and II
D) Neither

Answer: C) Both Photosystem I and II

Explanation:
Non-cyclic photophosphorylation involves both Photosystem I and Photosystem II, leading to the production of ATP, NADPH, and oxygen.

MCQ 59:
What is the role of magnesium in chlorophyll?

A) Energy storage
B) Electron donor
C) Structural component
D) Absorbs light

Answer: C) Structural component

Explanation:
Magnesium is a central atom in the chlorophyll molecule and is essential for maintaining the structure of chlorophyll and its ability to absorb light.

MCQ 60:
Which type of light is least absorbed by chlorophyll during photosynthesis?

A) Red light
B) Blue light
C) Green light
D) Violet light

Answer: C) Green light

Explanation:
Chlorophyll reflects green light, making it the least effective wavelength for photosynthesis.