Describe modifications of stem with suitable examples

A modification of leaf is-

Explain saponifiactiion of oils with a suitable example.

Differentiate vaccination and immunization/Describe the two types of vaccines with suitable examples?

Define ferrimagnetism with suitable examples.

Define finite and infinite set with suitable examples.

Thorn is a modification of

Differentiate means vaccination and immunization.Describe the two type of vaccines with suitable examples.