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Why Nitrogen Matters Quiz

Why Nitrogen Matters Quiz

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Question 1 of 8

1. Question

Why was nitrogen historically limiting for agriculture?

Crops did not require much nitrogen
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Natural nitrogen sources supplied less nitrogen than crops removed
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Ancient farmers did not understand fertilisers
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Soil microbes locked all nitrogen away
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Question 2 of 8

2. Question

What percentage of global protein is supported by synthetic nitrogen fertiliser?

~10%
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~25%
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~48%
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~75%
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Question 3 of 8

3. Question

What proportion of applied fertiliser nitrogen is typically taken up by crops?

5–10%
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20–50%
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60–80%
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90–100%
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Question 4 of 8

4. Question

Which greenhouse gas is produced from nitrogen fertiliser and is 300× more potent than CO₂?

Nitrous oxide (N₂O)
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Methane (CH₄)
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Sulphur dioxide (SO₂)
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Carbon monoxide (CO)
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Question 5 of 8

5. Question

Which is NOT a pathway of nitrogen loss?

Nitrate leaching
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Ammonia volatilisation
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Photosynthetic carbon fixation
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Nitrous oxide emissions
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Question 6 of 8

6. Question

How much CO₂ does the Haber–Bosch process release each year?

Less than 1 million tonnes
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Around 10 million tonnes
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Around 100 million tonnes
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Over 500 million tonnes
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Question 7 of 8

7. Question

Improving NUE means:

Applying zero nitrogen
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Using nitrogen more efficiently inside the plant
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Switching all crops to legumes
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Only applying organic fertiliser
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Question 8 of 8

8. Question

If global NUE increased by 20%, how much pollution could be avoided annually?

~1 million tonnes
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~5 million tonnes
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~10 million tonnes
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~30 million tonnes
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