Silent valley of Kerala is being preserved because it has
Rare plants and animals
Only natural forest of India
Costly timber plants
Recreational value
Kaziranga is famous for
$A$ : Biosphere reserves are also included under the ex-situ conservation strategies.
$R$ : Cropping and grazing are allowed in the transition zone of biosphere reserve.
Number of wild life is continuously decreasing. What is the main reason of this?
Estuaries are considered as nutrient rich and trap
Which of the following is an agrostologic method of soil conservation?