Name two marine organisms which also reproduce by the same method as yeast but form colonies.

What is yeast? Describe the process of reproduction in yeast with the help of labelled diagrams.

Name a tiny fresh-water animal which reproduces by the same method as that of yeast ? What is this method known as ?

What is meant by 'grafting' as a means of propagation in plants?

Define 'stock' and 'scion'.