In which direction do substances move in and out of a cell membrane during active transport? A. From low concentration to low concentration B. From high concentration to low concentration C. From high concentration to high concentration D. From low concentration to high concentration

D. From low concentration to high concentration

Explanation:

Molecules and substances move in and out of living cells via the cell membrane, which act as the semi-permeable membrane. Ideally, substances move from a region where they are highly concentrated to a region where they are low in concentration. This type of transport is called passive transport.

However, another type of transport called ACTIVE TRANSPORT occurs where substances move from a region where they are low in concentration to a region where they are high in concentration. This type of transport occurs against the concentration gradient between the cell membrane and the extracellular solution. Hence, it requires energy in form of ATP to occur.

This kind of transport described above is called ACTIVE TRANSPORT, and it requires energy input because it occurs against concentration gradient i.e. from low concentration of substance to high concentration.

increase soil erosion                                             reduce soil erosion

cattle grazing                                                         hydroseeding

deforestation                                                         contour plowing

                                                                                planting vegetation

plant roots basically hold the top soil

together and stop soil erosion because

in such situation top soil is not removed

during flood but cattle grazing causes

soil erosion because cattle consume the

grasses and herbs and top soil is exposed.

same situation occurs because of

deforestation, the trees and plants are cut

down to expose top soil which causes soil

erosion