Biology 9th Chap 10 : Topic 4 - Maryam Publications

Biology Chapter 10 : Topic 4

Sources of Variation

1 / 15

Variation refers to:

A) Similarities among organisms

B) Formation of new cells

C) Classification of organisms

D) Differences among individuals of the same species

2 / 15

Variation is important because it:

A) Stops reproduction

B) Prevents evolution

C) Reduces biodiversity

D) Provides the raw material for natural selection

3 / 15

Which of the following is a major source of variation?

A) Mutation

B) Excretion

C) Mitosis

D) Respiration

4 / 15

A mutation is:

A) A method of classification

B) A change in genetic material (DNA)

C) A type of reproduction

D) A change in environmental conditions

5 / 15

During sexual reproduction, variation arises mainly due to:

A) Fertilization and recombination of genes

B) Photosynthesis

C) Transpiration

D) Budding

6 / 15

Which process during meiosis increases genetic variation?

A) Binary fission

B) Budding

C) Crossing over

D) Germination

7 / 15

Random fusion of gametes contributes to variation because:

A) Different combinations of genes are formed

B) Chromosome number decreases

C) Organisms stop evolving

D) Mutations are prevented

8 / 15

Which source of variation occurs suddenly in DNA?

A) Transpiration

B) Mutation

C) Respiration

D) Pollination

9 / 15

Which of the following can lead to speciation?

A) Natural selection

B) All of the above

C) Isolation

D) Genetic variation

10 / 15

Why is variation beneficial to a population?

A) It eliminates diversity

B) It increases the chances of survival in changing environments

C) It stops natural selection

D) It prevents adaptation

11 / 15

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

A) Produce more mutations

B) Be more vulnerable to environmental changes

C) Evolve faster

D) Adapt more easily

12 / 15

Which process directly produces new combinations of genes during meiosis?

A) Translocation

B) Crossing over

C) Respiration

D) Diffusion

13 / 15

Evolution depends upon:

A) Lack of reproduction

B) Stable environments only

C) Absence of variation

D) Availability of variation within populations

14 / 15

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

A) Genetic variation

B) Germination

C) Digestion

D) Excretion

15 / 15

Which statement best explains the relationship between variation and evolution?

A) Variation prevents speciation.

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

C) Variation slows evolution.

D) Evolution occurs without variation.

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