What is a bacteriophage?

Helotism is a term used for the symbiosis of

What is the cup-shaped fruiting body of a lichen called?

Which of the following is a characteristic feature of viruses?

Identify the components of lichens.
Phycobiont $\quad\quad\quad$ Mycobiont

Assertion $(S)$: Viruses are considered as a link between living and non-living organisms.
Reason $(R)$: Viruses replicate only when they are inside a host cell,whereas they behave as non-living particles in a free state.