Select the statement that best describes commensalism.

Given below are two statements.
Statement $I$: Intraspecific competition occurs between organisms of the same population.
Statement $II$: Such interaction may be beneficial,harmful or neutral to the interacting individuals.
In the light of the above two statements,choose the correct option.

In a stable population,what is the ecological role of predation?

Select the $CORRECT$ match:

List-$I$	List-$II$
$i$. Competition	$a$. Tapeworm and man
$ii$. Commensalism	$b$. Lichen
$iii$. Mutualism	$c$. Cattle egret and cattle
$iv$. Parasitism	$d$. Lions and Leopards

Which of the following is most appropriately defined?

Which one of the following is categorised as a parasite in the true sense?