NEET BIOLOGY

Detailed explanation-1: -Human activities are a primary cause of desertification. These activities include overgrazing of livestock, deforestation, overcultivation of farmland, and poor irrigation practices. Overgrazing and deforestation remove plants that anchor the soil. As a result, wind and water erode the nutrient-rich topsoil.

Detailed explanation-2: -Human activities that contribute to desertification include the expansion and intensive use of agricultural lands, poor irrigation practices, deforestation, and overgrazing. These unsustainable land uses place enormous pressure on the land by altering its soil chemistry and hydrology.

Detailed explanation-3: -removal of the natural vegetation coverby taking too much fuel wood, agricultural activities in the vulnerable ecosystems of arid and semi-arid areas, which are thus strained beyond their capacity. These activities are triggered by population growth, the impact of the market economy, and poverty.

Detailed explanation-4: -Desertification in irrigated regions is caused by (1)sedimentation or siltation; (2) use of poor quality water; (3) waterlogging; and (4) salinization from rising groundwaters–or a combination of 2 or more of these.