Sometimes parasites themselves are parasitised by other organisms. Such parasites are known as:

Two butterfly species are competing for the same nectar of a flower in a garden. To survive and coexist together,they may avoid competition in the same garden by:

Which of the following is not a defence evolved by a prey to avoid predators?

Animals have evolved various innate mechanisms to avoid predators. Some examples are given below. Select the incorrect example.

Match the Column-$I$ and Column-$II$:

Column-$I$	Column-$II$
$(P)$ Lichens	$(i)$ Parasitism
$(Q)$ Abingdon tortoise and goat	$(ii)$ Commensalism
$(R)$ Sea anemone and clown fish	$(iii)$ Competition
$(S)$ Human and liver fluke	$(iv)$ Mutualism

Observe the set of $4$ figures $A$,$B$,$C$ and $D$ and answer the following questions:
$(i)$ Which one of the figures shows mutualism?
$(ii)$ What kind of association is shown in $D$?
$(iii)$ Name the organisms and the association in $C$.
$(iv)$ What role is the insect performing in $B$?