Small population of three organisms P, Q and R were reared in captivity for sometime. The given graph shows changes in their populations over time.

Study the graph and select the correct statements regarding organisms P, Q and R.
(i) could be a heterotroph whereas P and R could be autotrophs.
(ii) Q is a herbivore that feeds exclusively on P.
(iii) If population of R is removed from this community, then population of P will decrease whereas that of Q will increase.
(iv) P is a carnivore, Q is a herbivore whereas R is an omnivore that feeds on both P and Q.
(v) R is the predator of P which in turn is the predator of Q.

Options

A. (ii) and (v) only
B. (i), (iii) and (iv) only
C. (i) and (ii) only
D. (iii), (iv) and (v) only

Answer

C

Explanation

In the given graph P and R could be autotrophs and Q could be a heterotroph (herbivore). Initially population of P was greater than Q. Then gradually population of increases and population of P decreases. The point at which population of P gets exhausted, population of Q also starts decreasing. This shows Q feeds exclusively on P.