A) There has been an increase in annual rainfall
B) The rate of silting of dams has gone up
C) There has been increased deforestation in the catchment areas
D) Increased areas of land is being self-cultivated
Correct Answer: B
Solution :
Steep slopes cause fast, running of water which result in erosion and do not permit the accumulation of humus so the soil becomes denuded. In such soil plants cannot grow properly and vegetation changes into xerophytic plants. In valleys humus accumulates, so they have luxuriant vegetation and slopes contain xerophytic plants.
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