The relationship between algae and fungi in a lichen is known as:

Match the following columns:

Column-$I$	Column-$II$
$P$. Calotropis	$I$. Special chemical
$Q$. Cactus and Acacia	$II$. Camouflage
$R$. Monarch butterfly	$III$. Thorns
$S$. Some species of insects and frogs	$IV$. Glycosides

Gause's law is true only when

Which type of interaction is seen between sea anemone and clown fish?

An organism that depends on others can be described as a ..... parasite.

$A$: Five closely related species of warblers living on the same tree can avoid competition and co-exist.
$R$: This occurs due to behavioural differences in their foraging activities.