What is an embryoid?

Given below are two statements:
Statement $I$: In suspension culture and callus culture technique,subculturing is necessary.
Statement $II$: Subculturing is needed only in suspension culture technique.
In the light of above statements,select the correct option given below:

Which of the following is a method used for growing rare plants?

Plants,in comparison to animals,are more rapidly manipulated by genetic engineering. Select the most probable reason for this.

Match the following columns:

Column $I$	Column $II$
$(a)$ $UV$ light	$(p)$ Embryo culture
$(b)$ Protoplast isolation	$(q)$ Plant part
$(c)$ Orchid	$(r)$ Sterilization
$(d)$ Explant	$(s)$ Callus culture

In which of the following are somaclonal variations observed?