$a.$ Loss of unnecessary sense organs
$b.$ Pressence of adhesive organs
$c.$ Presence of suckers
$d.$ High reproductive capacity
$e.$ Well developed digestive system
Choose correct option w.r.t. parasites

In an association of two animal species, one is a termite which feeds on wood and the other is a protozoan Trichonympha present in the gut of the termite. What type of association they establish ?

Explain the general information about the population interaction and show the various results shown between them.

In an aqueous environment, the microscopic animals are collectively called

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

What is the ecological principle behind the biological control method of managing with pest insects?