The missing organism in food chain of grass → ? → frog → snake is : 

(C) frog – fish

D) The population of tigers decreases and the population of grass increases.

(D) Consumers

A) grass → grass hopper → frog → snake → eagle

C) Grasshopper and rabbit

C) It will produce the exact copy of organism X.

1. Tongue 2. Worms 3. Crane 4. Hooked 5. Ruminants

(iii) Both assertion and reason are wrong statement.

Sparrow/crow.