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HomeAQA GCSE BiologyDecomposition and the role of microorganisms
AQA · GCSE · Biology

Decomposition and the role of microorganisms
Practice Questions

15 AQA GCSE Biology questions on Decomposition and the role of microorganisms, 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 Decomposition and the role of microorganisms.

Try 2 sample questions on Decomposition and the role of microorganisms

Question 1 · 1 mark · Difficulty 1/3

Decomposition is mainly carried out by:

  1. Microorganisms such as bacteria and fungi
  2. Producers
  3. Apex predators
  4. Herbivores only
Show answer & explanation
✓ Answer: AMicroorganisms such as bacteria and fungi
Decomposers (bacteria and fungi) break down dead organisms and waste, recycling nutrients.
Question 2 · 1 mark · Difficulty 2/3

Which conditions speed up the rate of decomposition?

  1. Warmth, moisture and oxygen
  2. Cold and dry
  3. No water at all
  4. Freezing temperatures
Show answer & explanation
✓ Answer: AWarmth, moisture and oxygen
Decomposers work fastest in warm, moist, oxygen-rich conditions, which is why compost heaps are kept moist and turned.
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AQA GCSE Biology: Decomposition and the role of microorganisms FAQ

Is Kramizo free for AQA GCSE 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 Decomposition and the role of microorganisms practice with other Biology topics or even switch to a totally different AQA 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 Decomposition and the role of microorganisms questions aligned to the official AQA GCSE Biology syllabus?
Every question is written against the published AQA GCSE Biology specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real AQA 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 AQA.
How is Decomposition and the role of microorganisms typically tested on AQA GCSE Biology papers?
Decomposition and the role of microorganisms appears across multiple question types on real AQA GCSE 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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