The observations that support the hypothesis that chloroplasts have evolved from cyanobacteria is that they both perform photosynthesis with the help of theri thylakoid membranes.
Chloroplasts and cyanobacteria, both have interior membranes that organise the photosynthesis' light reactions similarly. Thylakoid membranes are shared by cyanobacteria, chloroplasts of plants and algae, galactolipids and sulfolipids, numerous photosystem constituents, and photosynthetic pigments. Overall, these characteristics of substance, structure, and function were viewed as solid proof that chloroplasts originated in cyanobacteria.
Cyanobacteria that have chloroplasts are said to be endosymbiotic. Despite the fact that cyanobacteria are prokaryotes, they are commonly referred to as blue-green algae. They belong to a large group of gram-negative bacteria that can perform photosynthesis.
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