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In the thylakoid, pigments are organised into two discrete photochemical

(a) ribosomal units, the 70S and the 80S units Your answer
(b) complexes called cristae, on the inner membrane Your answer
(c) light harvesting complexes, within PS I and PS II Correct
(d) reaction cycles, the PEP and the RuBP cycles Your answer

Your answer: Correct answer: (c)

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Explanation

Why (c) is correct

In the thylakoid membrane, pigments are organised into two light harvesting complexes (LHC), within photosystem I and photosystem II.

Why the other options are wrong

(a) · your answer 70S and 80S units are ribosomes, not pigment complexes.
(b) · your answer Cristae belong to mitochondria.
(d) · your answer PEP and RuBP cycles are carbon-fixing pathways, not pigment complexes.

NCERT point: Each photosystem has an LHC (antenna) and a reaction centre.

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