What is meant by the term 'fission' as used in biology ?

Name two plants which are usually propagated by artificial propagation methods. Name the method of artificial propagation used in each case.

Describe the layering method for the artificial propagation of plants. Illustrate your answer with the help of a labelled diagram. Name any five plants which are propagated by the layering method.

How does binary fission differ from multiple fission ?

Name one organism which reproduces by binary fission and another which reproduces by multiple fission.