Test Index

WAEC Agriculture 2012 Paper

Question : 12

Total: 49

Solution:

Concept:

Loss of soil nitrogen happens when bacteria convert nitrates into nitrogen gas.

Explanation:

The process is called denitrification.

Denitrifying bacteria remove oxygen from nitrates (

\mathrm{NO}_3^-

) in the soil.

This releases nitrogen gas (

\mathrm{N}_2

) into the atmosphere.

Thus, the soil loses nitrogen in this process.

Answer:

C. denitrification

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