Which of the following is an example of a defence used by plants against herbivores?
$I.$ Production of caffeine, tannin quinine
$II.$ More production of non-woody tissues
$III.$ Productions of hairs, thorns, spines
$IV.$ Production of hormone-like chemicals that interfere with insect metamorphosis
Select the correct pair
$I$ and $II$
$II, III$ and $IV$
$I, II$ and $III$
$I, III$ and $IV$
Level of competition between species depends on
$I.$ availability of resources
$II.$ population density
$III.$ group interaction of organism
Choose the correct combination
Which one of the following is not a parasitic adaptation?
In figs pollination done only by..............., not by any another.
Small fish get stuck near the bottom of a shark and derives its nutrition from it. This kind of association is called as
Mycorrhizae are the example of