question_answer

                                     

(i) Viviparity is considered to be more evolved than in comparison to oviparity. Justify.

(ii) What is 'Panspermia theory' of origin of life?

Answer:

(i) Viviparity is considered to be more evolved because the young ones are protected inside the mother's body and are looked after once they are born, leading to more chances of survival, e.g. mammals. However, in oviparity, the female lays fertilised/unfertilised eggs covered by a hard calcareous shell in a safe place in the environment. The chances of survival are less as the young ones are left on their own. Therefore, Viviparity is considered to be more evolved in comparison to oviparity.

(ii) The theory of Panspermia or cosmozoic was given by early Greek thinkers. This theory states that the spores or Panspermia came from outer space and developed into the living forms.