Chloroplasts found in plants arose via .a. endosymbiosis of euglenids b. endosymbiosis of cyanobacteria c. endosymbiosis of proteobacteria d. endosymbiosis of dinoflagellates

b. endosymbiosis of cyanobacteria

Explanation:

A chloroplast is an organelle that plays important roles in the plants during the process of photosynthesis. It has certain pigments that are responsible for the trapping of the sunlight such as chlorophyll and some other pigments. Since each chloroplast has two membranes so named as the double-membrane organelles like mitochondria and some other organelles. It is considered that the evolution of the chloroplast took place by the process of endosymbiosis of cyanobacteria. Cyanobacteria are such kinds of prokaryotic organisms that have the ability to prepare their food by the mechanism of photosynthesis.  

Mitochondria produce atp, a high energy compound. atp is used for all sorts of enzyme-mediated reactions, such as making proteins/nucleotides/etc, certain compounds cross the cell membrane, muscles move, etc.  without this source of energy, a cell will die. it will not be able to repair itself, defend against pathogens, etc.

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