Science Define :

The organisms whose number is considerably declined and may become extinct very fast are called rare species.

Innumerable species of organisms occuring in nature is called species diversity.

Physical, chemical and biological factors affecting the living organisms in any possible way is collectively called as environment.

Direct or indirect changes in physical, chemical and biological properties of air, water and soil which will be harmful to humans and other living beings is called environmental pollution.

The forest conserved in the name of God and considered to be sacred is called sacred groves.

The place where organisms live and prosper is called as habitat .

The animals which feed exclusively on producers only are called primary consumers.

The animals which derive their food from primary consumers are called secondary consumers.

The organisms which decompose the dead organisms and derive their food are called decomposers.

Occurrence of diversity among the organisms of same species is called genetic diversity.

The organisms which are extremely less in number and continue to decline are called vulnerable species.

The organisms whose number is declined or their habitat is shrunk to such an extent that they can be extinct in near future if conservative measures are not implemented are called endangered species.

The biotic and abiotic factors and their interactions with each other form an ecosystem .

The organisms which produce their own food are called autotrophs.

The organisms which can prepare their own food and make it available for other organisms are called producers.

The animals which depend on producers or other organisms for food are called consumers .

Biodiversity is the richness of living organisms in nature due to presence of varieties of organisms, ecosystems and genetic variations within a species.

The science that deals with the study of interactions between biotic and abiotic factors of the environment is called as 'ecology' .