ECOLOGY
ENVIRONMENTAL ISSUES
|
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
|
|
|
Loss of grass destroys the soil.
|
|
|
Loss of grass causes droughts.
|
|
|
Increase in vegetation destroys the soil.
|
|
|
Increase in vegetation protects against droughts.
|
Detailed explanation-1: -As earlier stated, overgrazing is a primary contributor to desertification because it converts arable or pasture land into unproductive piece land. The resultant soil is thus not suited for growing food since it loses its essential nutrients.
Detailed explanation-2: -With the exception of irrigation-induced land degradation, desertification usually starts with the removal of vegetation cover by humans or livestock. Overgrazing and excessive fuelwood collection destroy the protective layer of plants, exposing the top layer soil to wind and water erosion.
Detailed explanation-3: -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-4: -Overgrazing When cattle are allowed to graze on the same field repeatedly, all the available grass, including the roots are eaten by them. This makes the topsoil vulnerable to wind and flowing water, leading to soil erosion.
Detailed explanation-5: -Overgrazing can reduce ground cover, enabling erosion and compaction of the land by wind and rain.. This reduces the ability for plants to grow and water to penetrate, which harms soil microbes and results in serious erosion of the land.