21)

The more characteristics two species have in common :

Class 10 Biology

A)

More closely they are related and more recently they had a common ancestors.

B)

More distantly they are related and more recently they have common ancestors.

C)

More closely they are related and more distantly they have common ancestors.

D)

More distantly they are related and more distantly they have common ancestors.

22)

What is the difference between genetic drift and change due to natural selection?

Class 10 Biology

A)

Genetic drift does not require the presence of variation.

B)

Genetic drift never occurs in nature, natural selection does.

C)

Genetic drift does not involve competition between members of a species.

D)

There is no difference.

23)

Which concept was not included in Charles Darwin’s theory of Natural Selection?

Class 10 Biology

A)

Struggle for existence

B)

Punctuated equilibrium

C)

Survival of the fittest

D)

Overproduction of offspring.

24)

Natural selection is called ‘survival of the fittest’. Which of the following statements best describes an organism?

Class 10 Biology

A)

How strong it is compared to other individuals of the same species.

B)

 How much food and resources it is able to gather for its offspring.

C)

The ability to adapt to the environment in the niche it occupies.

D)

The number of fertiie offspring it has.

25)

Human offspring’s sex is determined

Class 10 Biology

A)

through father’s sex chromosomes.

B)

through mother’s sex chromosomes.

C)

by hormones.

D)

by enzymes.