Silent Valley has been preserved as it has :

Options

A. Recreational value
B. Valuable timber plants
C. Natural forest
D. Rare plants and animals

Answer

D

Explanation

Silent valley has been preserved because of the presence of rare plants and animals. The flora of the valley about a 1000 species of flowering plants, 107 species of orchids. It also has rich in faunal diversity and harbours 34 species of mammals, 292 species of birds, 31 species of reptiles, 22 species of amphibians, 13 species of fishes, 500 species of butterflies and moths