What does the figure $X$ represent?

. . . . . . is the most convenient and cheap method of artificial vegetative propagation.

What does the following figure represent?

If a $Hydra$ is cut into two pieces,what will be the result?

On the margins of leaves of a plant called $Bryophyllum$,tiny plants grow complete with roots. These tiny plants fall off and continue to grow. This is a form of:

Which method of vegetative reproduction occurs in fungi?