Question 24
Oxygen is returned to the atmosphere mainly by:

(a) burning of fossil fuel
(b) respiration
(c) photosynthesis
(d) fungi

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Solution

(c) photosynthesis

Burning fossil fuels results in the emission of carbon dioxide in the atmosphere. Respiration is involved in water cycle whereas photosynthesis is the process by which plants make their food in the presence of carbon dioxide and sunlight, and gives out oxygen to the atmosphere.

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Question 13
Which step is not involved in the carbon-cycle?

(a) Photosynthesis
(b) Transpiration
(c) Respiration
(d) Burning of fossil fuels

Oxygen is returned to the atmosphere mainly by

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