NEET BIOLOGY

Detailed explanation-1: -According to the endosymbiosis theory, the host cell engulfed the bacterium, and instead of digesting it as food, it negotiated a functional relationship that enabled the host cell/endosymbiont to utilize oxygen in energy metabolism.

Detailed explanation-2: -The small cells (now called endosymbionts) benefited from the relationship by getting a safe home and nutrients. The large cells (now called hosts) benefited by getting some of the organic molecules or energy released by the endosymbionts.

Detailed explanation-3: -There are two major organelles in eukaryotic organisms that have resulted from endosymbiosis, mitochondria (common to most eukaryotes) and chloroplasts (found in plants and algae only), as well as a few less obvious examples.

Detailed explanation-4: -The prokaryotic cells that live inside eukaryotic cells are called endosymbionts. Endosymbiosis is a term used to describe two organisms living together with one inside the other. The word endosymbiont comes from two Greek root words: endo, meaning within, and symbios meaning, living together.

Detailed explanation-5: -An endosymbiont is one organism that lives inside of another one. All eukaryotic cells, like your own, are creatures that are made up of the parts of other creatures. Mitochondria, the important energy generators of our cells, evolved from free-living cells.