In commensalism,

Which of the following is an example of a defense used by plants against herbivores?
$I.$ Production of caffeine,tannin,quinine
$II.$ More production of non-woody tissues
$III.$ Production of hairs,thorns,spines
$IV.$ Production of hormone-like chemicals that interfere with insect metamorphosis
Select the correct pair.

Which one of the following is $INCORRECT$ about population interaction?

Predators also help in $A$ species diversity in a community,by $B$ the intensity of competition among competing prey species. Here $A$ and $B$ can be

Animals eating plants are categorised separately as $A$,they are in a broad ecological context,not very different from $B$. Choose the correct option for $A$ and $B$.

Which of the following statements is incorrect with respect to the above given figure?