(i) Climate : Rainfall and temperature influence the vegetation to a great extent. In India, regions receiving rainfall over 200 cm with high temperatures have tropical evergreen type of vegetation commonly. Regions with average temperature of 24° C 27°C and rainfall ranging between 150 cm 200 cm have tropical deciduous forests. Regions with moderate rain of 50 cm have thorn and scrub type of vegetation. Tropical evergreen forests are not very important economically because : 1. The trees are not found in pure stands thus, commercial exploitation proves to be very expensive. 2. These are hardwood trees, i.e., they do not float on water. 3. Its warm and wet climate throughout the year paves way for a thick vegetation so, there is a lack of transport facilities. Thus, these forests do not encourage the exploitation economically.