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(c) photosynthesis
(b) unburnt carbon particles or hydrocarbons suspended in air
(b) humus and soil particles only
(b) transpiration
(c) a change in pressure of the water bodies
(a) a biological process of nitrogen fixing bacteria present in the soil
(a) they are eco-friendly
(d) photosynthesis
(b) the number of water bodies in an area
(b) CO₂ in atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil
Oxygen is returned to the atmosphere mainly by
(c) photosynthesis
(c) photosynthesis
See lessLow-visibility during cold weather is due to
(b) unburnt carbon particles or hydrocarbons suspended in air
(b) unburnt carbon particles or hydrocarbons suspended in air
See lessTop-soil contains the following
(b) humus and soil particles only
(b) humus and soil particles only
See lessWhich step is not involved in the carbon cycle?
(b) transpiration
(b) transpiration
See lessThe term “water pollution” can be defined in several ways. Which of the following statements does not give the correct definition?
(c) a change in pressure of the water bodies
(c) a change in pressure of the water bodies
See lessThe nitrogen molecules present in air can be converted into nitrates and nitrites by
(a) a biological process of nitrogen fixing bacteria present in the soil
(a) a biological process of nitrogen fixing bacteria present in the soil
See lessAmong the given options, which one is not correct for the use of large amount of fertilizers and pesticides?
(a) they are eco-friendly
(a) they are eco-friendly
See lessOne of the following processes is not a step involved in the water-cycle operating in nature
(d) photosynthesis
(d) photosynthesis
See lessRainfall patterns depend on
(b) the number of water bodies in an area
(b) the number of water bodies in an area
See lessChoose the correct sequences
(b) CO₂ in atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil
(b) CO₂ in atmosphere → organic carbon in plants → organic carbon in animals → inorganic carbon in soil
See less