MICROANATOMY

Detailed explanation-1: -7.2 Primary and Secondary Endosymbiosis. A symbiotic relationship where one organism lives inside the other is known as endosymbiosis. Primary endosymbiosis refers to the original internalization of prokaryotes by an ancestral eukaryotic cell, resulting in the formation of the mitochondria and chloroplasts.

Detailed explanation-2: -Endosymbiosis is a mutually beneficial relationship between a host organism and an internal associate organism. The term is derived from the prefix “endo, ‘’ meaning within, and the word symbiosis, which refers to a mutually beneficial relationship between two closely associated organisms.

Detailed explanation-3: -The most significant examples of endosymbiosis are represented by the endosymbiotic acquisition of plastids and mitochondria, introducing photosynthesis and respiration to eukaryotes. However, there are numerous other endosymbioses that evolved more recently and repeatedly across the tree of life.