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Which of the following is the best reason why a photosystem has hundreds of antenna pigment molecules but only one reaction centre?

(a) Only one molecule of a pigment can absorb light. Your answer
(b) Energy trapped over a large area is funnelled to one centre. Correct
(c) Antenna molecules split water; the centre makes ATP. Your answer
(d) The reaction centre stores the energy as starch. Your answer

Your answer: Correct answer: (b)

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Explanation

Why (b) is correct

Hundreds of antenna molecules trap light over a large area and funnel the energy to one reaction centre, which makes photosynthesis more efficient.

Why the other options are wrong

(a) · your answer Every pigment molecule can absorb light.
(c) · your answer Antenna molecules do not split water.
(d) · your answer The reaction centre does not store starch.

NCERT point: Antennae increase the efficiency of light harvesting.

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