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Cycles within ecosystems
Practice Questions

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

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Try 2 sample questions on Cycles within ecosystems

Question 1 · 1 mark · Difficulty 1/3

Which of the following best describes the role of decomposers in the carbon cycle?

  1. They convert carbon dioxide into oxygen through photosynthesis
  2. They release carbon dioxide by breaking down dead organic matter through respiration
  3. They absorb carbon compounds directly from the atmosphere
  4. They convert nitrogen compounds into carbon dioxide
Show answer & explanation
✓ Answer: B — They release carbon dioxide by breaking down dead organic matter through respiration
Award 1 mark for recognising that decomposers release carbon dioxide through respiration of dead organic matter. A is incorrect — this describes the role of producers, not decomposers. C is incorrect — decomposers obtain carbon from organic matter in soil, not directly from the atmosphere. D is incorrect — this confuses the carbon cycle with the nitrogen cycle.
Question 2 · 1 mark · Difficulty 2/3

A farmer in Brazil noticed that soil fertility decreased after several years of continuous crop cultivation. Which of the following practices would most effectively restore nitrogen levels in the soil?

  1. Increasing irrigation to wash more nitrogen into the soil
  2. Planting leguminous crops such as beans or clover
  3. Adding more carbon dioxide to increase photosynthesis
  4. Removing all decomposers from the soil
Show answer & explanation
✓ Answer: B — Planting leguminous crops such as beans or clover
Award 1 mark for recognising that leguminous crops contain nitrogen-fixing bacteria in root nodules that convert atmospheric nitrogen into nitrates. A is incorrect — irrigation does not add nitrogen; it may actually leach nitrates away. C is incorrect — carbon dioxide does not restore nitrogen levels. D is incorrect — decomposers are essential for releasing nitrogen from organic matter.
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20 questions · 25 min · free

CIE IGCSE Biology: Cycles within ecosystems FAQ

How many CIE IGCSE Biology questions on Cycles within ecosystems are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Cycles within ecosystems 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 Cycles within ecosystems 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 Cycles within ecosystems 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 Cycles within ecosystems typically tested on CIE IGCSE Biology papers?
Cycles within ecosystems 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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