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In algae and green plants, photosynthesis takes place in chloroplasts. Same as to a mitochondrion, a chloroplast has a highly permeable outer membrane and an inner membrane which is impermeable to most ions and molecules. Within every chloroplast lies the stroma, containing soluble enzymes analogous to the matrix of a mitochondrion. Moreover, while the inner membrane  of a mitochondrion holds  the electron  transport  chain  and ATP synthase in a chloroplast these are situated, together with photosynthetic light-absorbing systems  in stacks of flattened  membranes  within  the stroma  known as  thylakoids. Therefore the main events of trapping solar energy in photosynthesis and the light reactions and occur in the thylakoid membranes. The dark reactions take place in the stroma.  The light reactions take place in the bacterial plasma membrane or in invaginations of it known as chromatophores in photosynthetic bacteria.