Question

10. Which statement describes the “selection” method of natural selection?

    a. Organisms that are better adapted tend to kill off those that are not as well adapted.

    b. Organisms that are better adapted tend to produce more offspring than those that are

not as well adapted.

    c. Organisms that are better adapted tend to “take over” more area than those that are not as well adapted.

    d. Organisms that are better adapted tend to live longer than those that are not as well adapted.

11. The most probable explanation for foxes having short ears in the arctic is

    a. the fox needed short ears and so each generation had shorter ears.

    b. they are acquired characteristics.

    c. natural selection favored short ears because they are closer to the body and therefore stay

                warmer.

    d. natural selection favored long ears because they were an

      advantage in hearing enemies and in hunting.

Answer 1

10. The "selection" method of natural selection is described by-

Option- (d) Organisms that are better adapted tend to live longer than those that are not as well adapted.

explanation- According to Darwin's theory of Natural Selction, the concept of Survival of the fittest clearly states that, even after any natural calamitities, an organism who can tolerate any environmental change and survive for that time, will continue it's race. Others who cannot tolerate the change will not survive and die.

11. The most probable explanation for fox having short ears in arctic is-

Option- (c) natural selection favoured short ears because they are closesr to the body and therefore stay warmer.

explanation- We know the extreme climatic condition of arctic region is not favourable for all types of life forms. Animals living there must adapt in that region by altering certain physiological processes. One of this is shown by the arctic fox, having short ears, which help them to conserve heat in their body as it is nearer to their body.Thus reducing heat loss.