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Question

PS-II occurs only in

A
stroma
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B
granal thylakoids
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C
stroma lamellae
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D
matrix
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Solution

The correct option is B granal thylakoids
The adjacent closed surface between the sacs of grana in thylakoids is known as an appressed region. Photosystem II is found in appressed of granal thylakoid.
PS I is located at the outer surface of the grana thylakoid membrane (non appressed granal regions and stroma lamella).
The region of thylakoid that faces the stroma is known as non-appressed region.

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