Which of the following statements is true with respect to variation?

Variation is minimum in asexual reproduction.

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Change in genetic composition will not results in variation.

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Selection of variants by environmental factors form the basis of evolutionary process.

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Variations are the raw materials for evolutionary forces to act upon.

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Solution

The correct option is C Variations are the raw materials for evolutionary forces to act upon.
Variations are the raw material on which evolutionary forces act upon. All variations are not important in evolution. Only heritable changes which change the genetic material are important in evolution. Asexual reproduction does not involve mixing of gametes. It will give rise to progeny which are identical to their parents. It does not involve variation.
So, the correct answer is option D.

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Similar questions

Q. Question 15
Which of the following statements is not true with respect to variation?

(a) All variations in a species have equal chance of survival.
(b) Change in genetic composition results in variation.
(c) Selection of variants by environmental factors forms the basis of evolutionary processes.
(d) Variation is minimum in asexual reproduction.

Which of the following statement is incorrect with respect to variations?
(a) all variations in a species have an equal chance of survival
(b) change in genetic composition results in variations
(c) selection of variations by environmental factors torus the basis of the evolutionary process
(d) variations are the minimum in asexual reproduction

Q. Selection of variants by environmental factors forms the basis for evolutionary processes.

Assertion (A): Differences in a population are created by genetic variations.

Reason (R): Driving factor for variation is the source of sexual reproduction and also asexual reproduction.

Offspring formed by sexual reproduction exhibit more variation than those formed by asexual reproduction because
(a) Sexual reproduction is a lengthy process
(b) Gametes of parents have qualitatively different genetic composition
(c) The genetic material comes from parents of two different species
(d) Greater amounts of DNA is involved in sexual reproduction

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