Question

plzzzz tell this fast

Answer 1

1 Normally in hill areas there will be land slides.due to this soil erosion will occur. Soil erosion will leads to leaching of soil nutrients. To avoid this step farming followed in those areas.
2 Because moon has no atmosphere. Earth atmosphere protects life on the earth by absorbing ultraviolet radiation coming from the sun and maintaining the average temperature on the surface ( not too hot and not too cold) through green house effect.
3 Addition of undesirable chemicals like pesticides, fertilizers, industrial waste and domestic wastes not only kill the organisms, they also cause diseases to the aquatic organisms. Besides, the requirement of oxygen by aquatic organisms is also increased. There is a reduction in the dissolved oxygen in water which adversely affects the aquatic organisms.
4 Dust remains present in air as suspended particles. It can cause allergy and other respiratory diseases. It also affects plant growth by covering stomata on leaf surface and blocking them. It acts as the carrier of toxic compounds like heavy metals. Thus, dust acts as a pollutant.
5 Plants cannot utilize atmospheric nitrogen directly. Hence, leguminous plants establish a symbiotic relationship with bacteria like Rhizobium. Both the organisms of symbiotic relationship are mutually benefited. Leguminous plant provides shelter and nourishment for the bacteria and in turn bacteria fix atmospheric nitrogen to the plant. The bacteria and the leguminous plant involved in this symbiotic relationship.