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1. Biotic components of biosphere is
not
constituted by –
(a) Producers (b) Consumers (c) decomposer (d) air
2. Major source of
mineral in soil is
the –
(a) Parent rock
from which soil is
covered (b) Plants
(c)
animals (d)
bacteria
3. One of the following factors does not lead to soil
formation in nature
(a) the sun (b)
water (c) wind (d) polythene bags
4. The nitrogen molecules present in air can be converted into nitrates and nitrites by –
a) a biological process of nitrogen fixing bacteria present in soil b)
a biological process of carbon fixing factor present in soil
c) any of the industries manufacturing nitrogenous compounds.
d) The plants used as cereal crops in field
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