Tropical thorn forests are these:

Largest amount of fresh water on our planet is contained:

A lake with an inflow of domestic sewage rich in organic waste may result in:

Management of forest by coppicing depends upon stumps height is / are:

The causes of loss of biological diversity are:

These are generally, but not always, developed above the birch zone and in patches, sometimes extensive, within it, probably conditioned by edaphic and biotic factors, in Kashmir, Gilgit, Chitral and Hazara. This type ascends normally to ________ or more above the sub-alpine forests and climate must be similar but more severe than in sub-alpine forests: