Reproduction Assignment class x

Q1 Why is variation important for species and not for an individual?
A Variation is a slow process which enables organisms to adapt themselves according to the changing environment .The process of climate change is very slow and so is the variation ,thus over a long period of time the species will be able to survive the changing environment but as far as individual is concerned ,he will not be able to realize any benefit of variation in his life span.

Q2 What is difference between binary and multiple fission?


Binary Fission :
(i) Nucleus divides into two parts.

(ii) It occurs during normal conditions.
(iii) It gives rise to two individuals.
(iv) Cytoplasm divides after each nuclear division.
e.g., Amoeba.
Multiple Fission :
(i) Nucleus divides into many parts.
(ii) It takes place during unfavourable conditions (Encysted stage),
(iii) It forms many individuals.
(iv) Cytoplasm does not divide after every nuciear division.
e.g., Plasmodium


Q What is the advantage of multiple fisssion to Plasmodium?
A Plasmodium being parasite needs to divide fast so that it can invade the host cells powerfully ,this process of multiple fission enables it to do so and survive otherwise host will kill it easily.