Niche overlap indicates:

Statements
$I.$ Recent studies support competition as suggested in 'Gause's Competitive Exclusion Principle'.
$II.$ Gause's hypothesis states that if two species compete for the same resources,then one will be eliminated by the other species.
$III.$ More recent studies point out that species facing competition might evolve mechanisms that promote co-existence rather than exclusion.
$IV.$ Gause's competitive exclusion principle is effective when resources are in excess.
$V.$ Unlimited resources give better opportunity for adaptation.
Choose the correct combination of statements.

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

Death of the host shall be disastrous to:

In a given habitat,plants show the least competition with which of the following?

Select the correct statement which explains best parasitism.