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Question

Light dependent reaction of photosynthesis occurs in the

A
stroma
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B
thylakoid membrane
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C
inner membrane of chloroplasts
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D
intermembrane space of chloroplast
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Solution

The correct option is B thylakoid membrane
Photosynthesis is an unique process during which the plants utilize relatively simple substances like CO2, water and synthesize food in presence of sunlight and chlorophyll.

The site of photosynthesis is the green plastid, chloroplast. Chloroplast is a double membrane bound cell organelle having an inner and outer membrane. The space enclosed within the membranes is called intermembrane space.

Photosynthesis includes light dependent reaction and light independent reaction. The light dependent reaction takes place in the grana. Grana are made up of units called thylakoids. The thylakoid membrane has pigments to trap light energy and carry out light dependent reactions.

The matrix of chloroplast is called stroma which has all enzymes essential for the light independent reactions that lead to synthesis of sugars.

Intermembrane space and inner membrane of chloroplasts does not have any obvious function during light reaction.

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