Constituents of pigment system I are located on

Granal thylakoids

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Stromal thylakoids

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Outer surface of granal and stromal thylakoids

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Stroma.

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Solution

The correct option is A Outer surface of granal and stromal thylakoids
The constituents of PS I is located in the thylakoid membrane of stroma and the outer surface of grana, contain a number of light-harvesting complexes and a reaction centre complex, which is a protein complex with two special chlorophyll a molecules and a primary electron acceptor.
So the correct option is 'Outer surface of granal and stromal thylakoids'.

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