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ZIMSEC A-Level Biology

8.14.2Nitrogen Cycle

Nitrogen Cycle in ZIMSEC A-Level Biology: what the syllabus expects you to know, the learning objectives and how to practise.
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Learning objectives

What the syllabus expects you to be able to do.

  1. 8.14.2.1Outline the nitrogen cycle and the roles of nitrogen-fixing (Rhizobium), nitrifying (Nitrosomonas, Nitrobacter) and denitrifying (Pseudomonas, Clostridium) bacteria.

Lessons

  • The nitrogen cycle and its bacteria

    35 min

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Sample question

A sample question on this topic. Answer it, check it, then read the worked answer.

Nitrogen Cycle: sample question

1 mark

Which process converts nitrate ions in the soil into nitrogen gas?

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