CBSE Class 10 Science 2017 · Paper 531/2 · Question 9
How does Hydra reproduce by budding ? Explain with the help of labelled diagrams. Why is this method of reproduction called asexual method ?
Answer
A bud grows on the parent Hydra and detaches as a new Hydra; it is asexual because only one parent is involved.
Budding in Hydra (see the labelled diagrams of the stages):
(1) At one specific site on the body of the parent Hydra, cells (regenerative cells) divide repeatedly and form a small outgrowth called a bud.
(2) The bud grows, and tentacles and a mouth develop at its free end, so it becomes a tiny Hydra while still attached to the parent.
(3) When fully mature, it detaches from the parent body and lives as a new, independent Hydra.
It is called an asexual method because only one parent is involved: no gametes are formed and no fertilisation takes place. The new individual is formed from the body cells of a single parent by cell division, so it is genetically similar to that parent.
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