The ancestral organism that gave rise to the modern-day chloroplast was:

Name: The ancestral organism that gave rise to the modern-day chloroplast was:
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Chloroplasts are believed to have originated from endosymbiosis of a photosynthetic cyanobacterium by an ancestral eukaryotic cell. This is known as the endosymbiotic theory of chloroplast evolution. Lichens, Wolbachia, rhizobial bacteroids, and methanogens are not known to possess chloroplasts or be involved in their evolution.

The Ancestral Organism That Gave Rise to the Modern-Day Chloroplast