Environment issue Test - 3

Elevated temperature in thermal pollution decreases the level of dissolved oxygen in water, as gases are less soluble in hotter liquids.

Polyblend consists of bitumen and plastic waste and is used for laying roads in Bangalore. Bitumen has excellent water-repelling properties which increases the life of the road. Recycled plastic waste was used in polyblend to reduce land pollution.

E-waste is recyclable but it has to be carried out in an environment friendly manner.

Some microorganisms produce new proteins, called stress proteins, when exposed to contaminants, such as cadmium and benzene. These stress proteins can be used as an early warning system to detect changes in levels of pollution.

Upper ozone is not considered as a pollutant. Upper ozone shields humans, plants and animals on the Earth from radiations coming from the Sun.

High intensity of noise pollution can cause blood vessels to contract, leading to high blood pressure.

Aeration is supplied to promote bacterial decomposition in the secondary stage of sewage water treatment. It is followed by chlorination to reduce the content of bacteria.

Peroxyacyl nitrate causes a condition known as silver leaf, in which the underside of the leaves turns silvery white or bronze.

Ocean ecosystem is very capable of resisting any of the small changes which occur. Thus, it is the most stable ecosystem in nature. They are stable in their chemical composition due to salinity and other features, like dissolved oxygen, light, temperature, which remain more or less constant. They are deep, continuous and large. Therefore, there are fewer chances of any prominent change which alter their structure and function.

Radiations emitted due to heating of the Earth are Infra red radiations. These are long wavelength rays, not visible but cause a lot of warming.