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CIE · IGCSE · Biology

Nitrogen cycle
Practice Questions

20 CIE IGCSE Biology questions on Nitrogen cycle, each with instant feedback and a full examiner-style mark scheme.

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✨ Revision guide includes key terms, worked examples and exam technique for Nitrogen cycle.

Try 2 sample questions on Nitrogen cycle

Question 1 · 1 mark · Difficulty 1/3

Which group of bacteria converts atmospheric nitrogen into nitrogen compounds that can be absorbed by plants?

  1. nitrifying bacteria
  2. nitrogen-fixing bacteria
  3. denitrifying bacteria
  4. decomposers
Show answer & explanation
✓ Answer: Bnitrogen-fixing bacteria
Award 1 mark for correct identification. A is incorrect because nitrifying bacteria convert ammonium compounds to nitrates, not atmospheric nitrogen. C is incorrect because denitrifying bacteria convert nitrates back to atmospheric nitrogen. D is incorrect because decomposers break down dead organic matter to release ammonium compounds.
Question 2 · 1 mark · Difficulty 2/3

Which of the following conditions would most favour denitrification in agricultural soil?

  1. well-aerated, dry soil with high oxygen content
  2. waterlogged, compacted soil with low oxygen content
  3. sandy soil with good drainage and high nitrate content
  4. soil with high populations of nitrifying bacteria
Show answer & explanation
✓ Answer: Bwaterlogged, compacted soil with low oxygen content
Award 1 mark for correct answer. Denitrifying bacteria are anaerobic and thrive in oxygen-poor conditions, converting nitrates to nitrogen gas. A and C are incorrect because well-aerated conditions favour aerobic bacteria, not denitrifiers. D is incorrect because nitrifying bacteria are aerobic and convert ammonium to nitrates, the opposite process.
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CIE IGCSE Biology: Nitrogen cycle FAQ

How many CIE IGCSE Biology questions on Nitrogen cycle are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Nitrogen cycle for CIE IGCSE Biology, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CIE paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CIE IGCSE students preparing for Biology?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Nitrogen cycle practice with other Biology topics or even switch to a totally different CIE subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Nitrogen cycle questions aligned to the official CIE IGCSE Biology syllabus?
Every question is written against the published CIE IGCSE Biology specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CIE.
How is Nitrogen cycle typically tested on CIE IGCSE Biology papers?
Nitrogen cycle appears across multiple question types on real CIE IGCSE Biology papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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