Reproduction in Plant - Modes of Reproduction Used by Multicellular Organisms - Regeneration

Explain the term “Regeneration” as used in relation to reproduction of organisms

Name two simple organisms having the ability of regeneration.

What is regeneration in organism?

Explain why, more complex multicellular organisms cannot give rise to new organisms through regeneration.

A thickened underground stem X of a plant which is swollen with stored food has a number of points Y on its surface. When the old stem X is planted in the soil of a field in the next growing season, then each point Y present on its surface grows into a new plant.

(a) What is the general name of the underground stems like X?
(b) Give one example of X.
(c) What are points Y present on X known as?
(d) Is it necessary to plant the whole of stem X in the ground to obtain its new plants? Explain your answer.
(e) What is the name of this method of reproduction of plants?
(f) What is the advantage of growing new plants from the underground stems like X?

One of the following organisms does not reproduce by fission. This is :
(a) Amoeba
(b) Leishmania
(c) Planaria
(d) Plasmodium

The two organisms which can regenerate fully from their cut body parts are :
(a) Paramecium and Hydra
(b) Hydra and Amoeba
(c) Planaria and Leishmania
(d) Hydra and Planaria

Name two plants  which can be grown from their broken stems.