Answer :
A membrane-bound organelle called a plastid, or chloroplast, is a kind that primarily facilitates photosynthesis in plant and algal cells.
While the chloroplasts of plants are enclosed by two membranes, those of kelps are encircled by four membranes. What difference does the endosymbiosis theory attempt to explain?
While kelp chloroplasts evolved through secondary endosymbiosis, plant chloroplasts did so through primary endosymbiosis.
It is possible that swallowed prokaryotes, which once existed as autonomous entities, gave rise to mitochondria and chloroplasts. The endosymbiotic interaction between the host eukaryote and the aerobic prokaryote, which eventually developed into a mitochondrion, began when an aerobic prokaryote was swallowed by a eukaryotic cell.
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