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NCERT · Class 10 · Science

Chapter 8: Heredity and Evolution

Practice each question, then open the answer or worked solution.

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Exercise-9.1

Textbook page 143 · 2 questions
Q1Written answer

If a trait A exists in 10% of a population of an asexually reproducing species and trait B exists in 60% of the same population, which trait is likely to have arisen earlier?

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Worked solution

Trait B is more probable to arise early as this trait has already been existing and replicating in a larger percentage of the population as compared to trait A.

Q2Written answer

How does the creation of variations in a species promote survival?

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Worked solution

Genetic variations enable the species to better adapt to changes in its environment. Moreover, it is an important force in evolution as it allows the frequency of alleles to increase or decrease through natural selection. These variations will determine the difference between extinction or continuation of the species.