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.
1. What is the general name of the underground stems like X ?
(i) Stem tubers
(ii) Leaf tubers
2. Give one example of X.
(i) Potato tubers
(ii) Onion tubers
(iii) Brinjal tubers
3. What are points Y present on X known as ?
4. Is it necessary to plant the whole of stem X in the ground to obtain its new plants ?
5. What is the name of this method of reproduction of plants ?
(iii) Vegetative propagation by tubers