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The oxygen cycle
The oxygen cycle components
Oxygen in soils
The oxygen cycle - Quiz

The oxygen cycle - Quiz

Answer each question below, then choose Check answers to see your score. You can reveal the correct responses after marking.

1 What is the oxygen cycle?

An unusual way to climb Mt Everest The exchange of oxygen between air, sea and land The increase of greenhouse gases

2 What proportion of our atmosphere is made up of Oxygen?

Two percent Twenty Percent Ninety seven and a half percent

3 What is an oxide?

Hide and seek with a large bull The joining of oxygen with an element like iron A health-giving facial treatment How oil and coal forms from old leaves

4 How does 'Ozone' (O3) help us?

It reduces traffic congestion in London It wells up from the ocean depths It absorbs harmful ultraviolet solar rays It allows aeroplanes to fly very high

5 Where does most atmospheric oxygen come from?

Photosynthesis of plants Photo-booth of children Deep oceanic currents Animals breathing out

6 What is respiration?

When you sweat after running around What scuba divers wear to breathe underwater Conversion of oxygen and food to energy Conversion of sunlight and CO2 to oxygen

7 Do plants use up oxygen?

No, plants only produce oxygen? Yes, photosynthesis uses oxygen Yes, plants respire using oxygen Only animals use up oxygen

8 Do oxygen levels fall in waterlogged soils?

Yes, all oxygen is displaced by water No, water doesn't affect oxygen levels Yes, oxygen levels are lowered by water

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