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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 – 9.6

Textbook page 158 · 2 questions
Q1Written answer

Why are human beings who look so different from each other in terms of size, colour and looks said to belong to the same species?

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Worked solution

While human beings do vary in colour and general appearance, their genetic makeup is identical to any other human. One of the speculations put forth for our drastic changes is due to evolutionary pressure, where the need to be easily recognised pushed us towards having widely different faces.

Q2Written answer

In evolutionary terms, can we say which among bacteria, spiders, fish and chimpanzees have a ‘better’ body design? Why or why not?

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Worked solution

Body designs are the result of environmental needs and pressure. Hence, we can’t conclude that one organism has a better body compared to another. For instance, fish have evolved a streamlined design as it is best suited for an aquatic environment. On the other hand, a spider or a chimpanzee might be ill-equipped to survive in such aquatic environments.