Tag: evs - i

If there were no atmosphere around the earth, the temperature of the earth will increase during day and decrease during night. In the absence of atmosphere around the earth, it will be like a moon. There would be no life, no winds, no rains, no fires, no protection against harmful solar radiations. Due to absence of atmosphere around the moon, the temperature ranges from -190$^0$C to 110$^0$C. Air is a bad conductor of heat. The atmosphere has an average temperature of the earth almost steady during the day and night. It prevents sudden increase in temperature during the day time. Also, it decreases the rate of escape of heat during night time.

The ozone layer was discovered by Charles Fabry and Henri Buisson in 1913. The depletion of ozone was discovered by Farman, Gardiner and Shanklin in 1985.

Weather is the state of the atmosphere which can change on a daily basis. It describes the degree to which it is hot or cold , humid or dry, calm or stormy etc. therefore, it cannot be the seasonal change in the atmosphere as that would mean changing of seasons. It cannot be average variation of atmospheric conditions as that would be climate change. It cannot be all of the above because two options indicate season and climate. So the correct answer is 'Short term properties of atmosphere.'

Carbon dioxide is a colourless gas with a density of about 60% higher than that of dry air. Carbon dioxide consists of a carbon atom covalently double bonded to two oxygen atoms. It occurs naturally in Earth's atmosphere as a trace gas. The current concentration is about 0.04% (410 ppm) by volume, having risen from pre-industrial levels of 280 ppm. Carbon dioxide is odourless at normally encountered concentrations. However, at high concentrations, it has a sharp and acidic odour.

Life is not possible without a stable atmosphere containing the right chemical ingredients for living organisms: hydrogen, oxygen, nitrogen, and carbon. These ingredients must be balanced. Therefore we need carbon dioxide, ozone as well as water vapours. These are present in minute quantities but are essential for life. So the correct answer is ' Carbon dioxide, ozone and water vapours'.

The resources can be divided into 5 types based on the resources of earth. These are Tej, Marut, Ap, Khsiti and Vyom. Tej is a basic resource from sun. Marut is basic resource from wind. Ap is basic resource from water. Khsiti is basic resource of earth. It represents air. Vyom is the basic resource of explorating space.