The formation of chloroplasts in plants during evolution as a result of the introduction of cyanobacteria

The formation of chloroplasts in plants during evolution as a result of the introduction of cyanobacteria into the primary eukaryotic cell is considered by the hypothesis?

This is considered by the theory of symbiogenesis. The appearance of various structures within cells has several different hypotheses. This also applies to chloroplasts. These organelles are very important for several reasons. Chloroplasts provide autotrophic nutrition to the cell. Thanks to this, heterotrophs appeared, which feed on plants, since they themselves cannot synthesize organic substances. Also, these organelles help maintain approximately the same composition of the air and provide other organisms with oxygen.