NCERT Solution | Heredity and Evolution | Class X

1.How evolution is essential for speciation?

Ans.: Evolution is a gradual process of accumulation of variations that provide survival advantage. Without variations new species could not be formed so evolution is essential for speciation.

2. What factors could lead to the formation of a new species?

Ans.: Factors that could lead to the formation of a new species are :

(i) Genetic variations

(ii) Natural selection

(iii) Reproductive isolation

(iv) Genetic drift

(v) Geographical isolation.

3. Will geographical isolation be a major factor in the speciation of a self-pollinating plant species?Why or why not?

Ans: Geographical isolation will not be a major factor for the speciation of a self-pollinating plant species because self pollination is occurring on the same plant and a natural barrier can act between two different organisms.

4. Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not?

Ans.: Geographical isolation will not be a major factor for the speciation of an organism that reproduces asexually, because asexual reproduction involves single parent and a natural barrier can act between two different organisms.

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