Q13 of 167 Page 208

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

This is because human beings reproduce. There are no geographical barriers so they interbreed easily and produce viable offspring. It is the result of variations that human beings look different from each other in terms of size, color and looks.


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11

Name two organisms which are now extinct and studied from their fossils.

 12

Out of the wing of a bird, wing of an insect and the wing of a bat:

(a) Which two are homologous organs?


(b) Which two are analogous organs?

 14

Name five varieties of vegetables which have been produced from 'wild cabbage' by the process of artificial selection.

 15

Choose the one term from the following which includes the other three: broccoli, wildcabbage, cauliflower, cabbage.