Species which occupy a similar ecological niche in similar communities occupying different biogeographical regions are called:

In a sea shore,the benthic animals live in sandy,muddy and rocky substrata and accordingly developed the following adaptations:
$(a)$ Burrowing
$(b)$ Building tubes
$(c)$ Holdfasts / peduncle
Match the suitable substratum against each adaptation.

Rainfall occurs in chaparral during

$A$ treeless biome is

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

$A$ group of two or more than two plant species is called as