Question

Give reasons for the following:
(1) Competition between intraspecific species tend to be more intense than the interspecific species.
(2) Lichens show obligate mutualism.
(3) Population of different species are not capable of breeding with each other.

Answer 1

(1) Intraspecific competition is more intense because the requirements of individuals of same species are very similar.
(2) Lichens set a good example of obligate mutualism because of the naturalistic relationship between the fungi and algae or cyanobacteria in which an algae prepares food, while the fungus helps in the absorption of nutrients and provide protection.
(3) Different species in a population are unable to breed with each other because of various types of biological and physical barriers.