Assertion: Biotic community has higher position than population in ecological hierarchy.
Reason: Population of similar individuals remains isolated in the community.

Assertion (A) is true but Reason (R) is not correct.

The organisms of all the species that live in a particular area and interact in various ways with one another form biotic community. Biotic community is a grouping that is higher than population. It is an assemblage of all the populations of different organisms occurring in an area. The different populations of a community do not remain isolated. They show interactions and inter-dependence.