This will happen if more number of rabbits are artificially introduced in a grass land ecosystem. 

I thought F or H = 80 is giving by n(F u H) = n(F) + n(H) - n(F n H)

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

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

C) Grasshopper and rabbit

D) all the given

Answer is (B) River

When he was in the office-room at night, he remembered all the devil and ghost stories. His friend Mani had seen the devil in the banyan tree, Muniswami’s father spat...

(a) Reduction in primary productivity. No biomass available for consumption by higher trophic levels/heterotrophs (b) Increase in primary productivity and biomass of producers. Carnivores population will subsequently dwindle due to food...