The association of a sea anemone living on the shell of a hermit crab is known as:

$A$ high density of elephant population in an area can result in

Match the columns:

Column-$I$	Column-$II$
$(a)$ Predation	$(i)$ Cuscuta and hedge plant
$(b)$ Commensalism	$(ii)$ Balanus and Chathamalus
$(c)$ Parasitism	$(iii)$ Cactus and Moth
$(d)$ Competition	$(iv)$ Orchid and Mango

Given below are two statements.
Statement $I$: $Calotropis$ growing in abandoned fields is never consumed by cattle and goats.
Statement $II$: $Calotropis$ produces highly poisonous cardiac glycosides.
In light of above statements,select the most appropriate answer from the option given below.

The interaction between two living organisms of different species which is beneficial to both but is not obligatory because they can live without each other is known as

Which of the following is an example of competitive interaction?