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Darwinism

Which of the ...

Question

Which of the following processes come into existence when variations are associated with geographical isolation?

A

Sexual reproduction

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B

Evolution

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C

Natural selection

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D

Speciation

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Solution

The correct option is D
Speciation

When organisms or members of a particular species show certain changes (variations) due to differences caused by geographical isolation, it is known as speciation.

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Q. Statement 1: In the process of evolution, one species always gets lost to give rise to new species.

Statement 2: The newly generated species are always better than the existing previous ones.

Statement 3: Natural selection and genetic drift leads to speciation.

Q. How many of the following is responsible for speciation?

(a) Mutation
(b) Geographical isolation
(c) Genetic drift
(d) Natural selection
(e) Reproductive isolation

Q. Statement 1: Speciation is a fast process.

Statement 2: Speciation may take place when variations are combined with geographical isolation.

Q. Which of the following statements about natural selection are correct?
(i) Natural selection tends to increase the characters that enhance survival and reproduction.
(ii) Individuals with better adaptive ability will produce more progeny.
(iii) Was considered as a mechanism of evolution by Darwin.

Consider the following terms/phrases:

1. Change in chromosome number

2. Geographical isolation

3. Competition for food

4. Reproductive isolation

Which of these factors are responsible for speciation?

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