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Photosynthesis

Oxygen is ret...

Question

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 24
Oxygen is returned to the atmosphere mainly by:

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

Question 24
Oxygen is returned to the atmosphere mainly by:

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

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

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

The burning of fossil fuels is one of the major sources of atmospheric Oxygen $(O_{2})$ .

What is the percentage of oxygen in the air? Name the biological process by which it is mainly returned to the atmosphere.

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