Q12 · Practice questionSimple familiar1 mark
QUESTION 12
Which conversion is carried out by nitrifying bacteria in the nitrogen cycle?
(A)
Ammonium to nitrite and then nitrate.
(B)
Atmospheric nitrogen directly to proteins.
(C)
Nitrate to atmospheric nitrogen.
(D)
Organic nitrogen directly to atmospheric nitrogen.
WORKED SOLUTION
1 markAnswer A
Answer
A
Working
Nitrification oxidises ammonium to nitrite and then nitrate. Nitrogen fixation converts atmospheric nitrogen to ammonia; denitrification returns nitrate nitrogen to the atmosphere.
Marking criteria
- Select A. [1 mark]
Practice question aligned to the current QCAA syllabus; review the worked solution and marking criteria.
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