Question

What is the difference between primary and secondary endosymbiosis?

Answer 1

Hint: There are many organisms existing in the environment that live in association with one another. They either help each other to satisfy nutritional needs or protect each other from predators.

Complete answer:
Endosymbiosis is a kind of symbiotic relationship in which two organisms live in association with each other such that one works as a host body for another. In simple words, one individual is found to be living inside the body of another one.
This endosymbiosis process is primarily of two types, that is, Primary endosymbiosis and secondary endosymbiosis.
Following is the difference between primary endosymbiosis and secondary endosymbiosis.

Parameters	Primary endosymbiosis	Secondary endosymbiosis
Definition	It is a process in which a eukaryotic cell engulfs a prokaryotic cell which can undergo photosynthesis.	It is a process in which a eukaryotic cell engulfs another eukaryotic cell which has already engulfed a prokaryotic cell in its past.
Sequence of Occurrence	The Primary endosymbiosis is the first in order to take place, i.e. it occurs before secondary endosymbiosis in all cases.	The Secondary endosymbiosis is the second in order to take place, i.e. it occurs after primary endosymbiosis in all the cases.
Examples	Cyanobacteria exhibit primary endosymbiosis.	Hatena exhibits primary endosymbiosis.

Note:
The symbiotic relationship is often regarded as the main reason behind the development of a double membrane in the cells and also in the cell organelles. Several organelles of the cells such as chloroplasts and mitochondria were once prokaryotic cells and underwent symbiosis to be transformed into their current form.