Biology 9th Chap 10 : Topic 4 - Maryam Publications

Biology Chapter 10 : Topic 4

Sources of Variation

1 / 15

Variation refers to:

A) Classification of organisms

B) Similarities among organisms

C) Differences among individuals of the same species

D) Formation of new cells

2 / 15

Variation is important because it:

A) Prevents evolution

B) Provides the raw material for natural selection

C) Reduces biodiversity

D) Stops reproduction

3 / 15

Which of the following is a major source of variation?

A) Excretion

B) Mitosis

C) Mutation

D) Respiration

4 / 15

A mutation is:

A) A method of classification

B) A type of reproduction

C) A change in genetic material (DNA)

D) A change in environmental conditions

5 / 15

During sexual reproduction, variation arises mainly due to:

A) Transpiration

B) Fertilization and recombination of genes

C) Budding

D) Photosynthesis

6 / 15

Which process during meiosis increases genetic variation?

A) Germination

B) Crossing over

C) Budding

D) Binary fission

7 / 15

Random fusion of gametes contributes to variation because:

A) Different combinations of genes are formed

B) Chromosome number decreases

C) Mutations are prevented

D) Organisms stop evolving

8 / 15

Which source of variation occurs suddenly in DNA?

A) Pollination

B) Mutation

C) Transpiration

D) Respiration

9 / 15

Which of the following can lead to speciation?

A) Isolation

B) Natural selection

C) All of the above

D) Genetic variation

10 / 15

Why is variation beneficial to a population?

A) It increases the chances of survival in changing environments

B) It eliminates diversity

C) It prevents adaptation

D) It stops natural selection

11 / 15

If all members of a speciess were genetically identical, the species would:

A) Produce more mutations

B) Adapt more easily

C) Be more vulnerable to environmental changes

D) Evolve faster

12 / 15

Which process directly produces new combinations of genes during meiosis?

A) Crossing over

B) Respiration

C) Translocation

D) Diffusion

13 / 15

Evolution depends upon:

A) Stable environments only

B) Availability of variation within populations

C) Absence of variation

D) Lack of reproduction

14 / 15

A population becomes resistant to a disease over generations. This is possible because of:

A) Genetic variation

B) Digestion

C) Germination

D) Excretion

15 / 15

Which statement best explains the relationship between variation and evolution?

A) Variation slows evolution.

B) Evolution occurs without variation.

C) Variation provides the differences on which natural selection acts.

D) Variation prevents speciation.

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