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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
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 less