Which of the following is $NOT$ a type of lichen based on its growth form?

The fungal partner of a lichen is commonly known as:

Which one of the following statements about viruses is correct?

Which one is the smallest among the following?

Statement $X$: Lichens are composed of two main components. Statement $Y$: In lichens,the phycobiont is the heterotrophic component and the mycobiont is the autotrophic component.

Match the column $I$ with column $II$:

Particles/Microorganisms	Diseases
$(i)$ Viroid	$(a)$ $\text{CJD}$
$(ii)$ Virus	$(b)$ Citrus canker
$(iii)$ Bacteria	$(c)$ Potato spindle tuber disease
$(iv)$ Prion	$(d)$ Mumps