Gause’s principle of competitive exclusion states that
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
Which of the following statements regarding species interdependence are true?
$I.$ An Association of two species where one is benefitted and other remains unaffected is called mutualism.
$II.$ An interspecific association where both partners derive benefit from each other is called commensalism.
$III.$ A direct food relation between two species of animals in which one animal kills and feeds on another is referred as predation.
$IV.$ A relationship between two species of organisms where both are partners are
benefitted from each other is called symbiosis
$I.$ Some species of insects and frogs are critically coloured (camouflaged)
$II.$ Some animals are poisonous
$III.$ Monarch butterfly are distasteful
The above adaptations are against
What is a keystone species