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(a) 75%
(d) air
(b) elemental form of oxygen
(a) parent-rock from which soil is formed
(d) polythene bags
(a) it moves along with oxygen into the cell
(b) thinning of the ozone layer
(c) excessive use of man-made compounds containing both fluorine and chlorine
(d) all of the above
(d) ammonia
Total Earth’s surface covered by water is
(a) 75%
(a) 75%
See lessBiotic component of biosphere is not constituted by
(d) air
(d) air
See lessThe process of nitrogen-fixation by bacteria does not take place in the presence of
(b) elemental form of oxygen
(b) elemental form of oxygen
See lessMajor source of mineral in soil is the
(a) parent-rock from which soil is formed
(a) parent-rock from which soil is formed
See lessOne of the following factors does not lead to soil formation in nature
(d) polythene bags
(d) polythene bags
See lessWhen we breathe in air, nitrogen also goes inside along with oxygen. What is fate of this nitrogen?
(a) it moves along with oxygen into the cell
(a) it moves along with oxygen into the cell
See less“Ozone-hole” means
(b) thinning of the ozone layer
(b) thinning of the ozone layer
See lessOzone layer is getting depleted because of
(c) excessive use of man-made compounds containing both fluorine and chlorine
(c) excessive use of man-made compounds containing both fluorine and chlorine
See lessWhich of the following is a recently originated problem of environment?
(d) all of the above
(d) all of the above
See lessWhich of the following is not a green house gas?
(d) ammonia
(d) ammonia
See less