(a) The graph given below shows species-area relationship of a certain region.

(i) Study the graph and explain what it represents
(ii) After a while, a small area was taken for constructing a road which divided the region into two. Write the impact this contstruction would have on species richness of the region.

OR

(b) How did Dr. David Tilman relate experimentally, the stability of community and its species richness? Explain.

(a) (i) Logistic growth curve given by Alexander Von Humboldt states that as the area increases, number of species also increases and after reaching at certain stage species diversity gets stationary.
(ii) Habitat loss due to fragmentation results in reduction of species richness.

OR

(b) According to Dr. David Tilman, “stability of a community depends on its species richness”. He performed an experiment were he found the plots with many species showing lesser variation that leads to stable community.