OBJECTIVE FORESTRY

Detailed explanation-1: -A program of afforestation involves planting of trees to prevent soil erosion and to increase the number of trees.

Detailed explanation-2: -The roots of a plants help hold the soil firmly thus not letting soil erode away when a rough stream of water flows through them. The roots hold the soil tightly.

Detailed explanation-3: -Tree roots reinforce soil layers, anchor the soil to bedrock and form buttresses against soil movement. Trees also reduce landslide risk by lowering soil moisture levels – interception, evaporation and transpiration are the primary mechanisms.