These small membranes are folded into disk-shaped structures known as thylakoids, which are arranged in stacks called grana. The grana are surrounded by stroma, a semifluid matrix that contains proteins and other material to support the grana. Photosynthesis happens in two steps.
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Answer:
These small membranes are folded into disk-shaped structures known as thylakoids, which are arranged in stacks called grana. The grana are surrounded by stroma, a semifluid matrix that contains proteins and other material to support the grana. Photosynthesis happens in two steps.
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