Class 10 Science Biology Heredity and Evolution



The evolution of species is based upon sum total of the species adaptive changes preserved by 
(a)
Human conservation
(b)
Speciation
(c)
Natural selection
(d)
Isolation
Correct answer: (c) 
Solution: All the changes in a species due to all the factors give rise to variations in the individuals. The nature then selects best suited variants and they are able to reproduce to leave progeny. Thus Natural Selection is the force that preserves best suited variants across generations.

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components of food
heredity and evolution
how do organisms reproduce?
microorganisms: friend and foe
why do we fall ill?