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Nutrient Cycles: Carbon Cycle, Nitrogen Cycle and Water Cycle
Practice Questions

20 CXC CSEC Integrated Science questions on Nutrient Cycles: Carbon Cycle, Nitrogen Cycle and Water Cycle, each with instant feedback and a full examiner-style mark scheme.

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Question 1 · 1 mark · Difficulty 1/3

Which of the following correctly describes what happens to carbon during the formation of fossil fuels?

  1. Carbon is released into the atmosphere through volcanic activity
  2. Carbon in dead organisms is converted to coal and oil over millions of years
  3. Carbon dioxide dissolves in rainwater to form carbonic acid
  4. Carbon is absorbed by phytoplankton in the Caribbean Sea
Show answer & explanation
✓ Answer: B — Carbon in dead organisms is converted to coal and oil over millions of years
Award 1 mark for recognising that fossil fuels form when dead organic matter is buried and subjected to heat and pressure over geological time, locking carbon away. A describes carbon release, not storage. C describes part of the short-term carbon cycle. D describes carbon uptake by living organisms, not fossil fuel formation.
Question 2 · 1 mark · Difficulty 2/3

A farmer in Trinidad notices that his pigeon pea plants grow better when planted near a field that previously grew black-eyed peas. Which process in the nitrogen cycle best explains this observation?

  1. Denitrification by soil bacteria
  2. Nitrogen fixation by Rhizobium bacteria
  3. Nitrification by Nitrobacter
  4. Ammonification of dead leaves
Show answer & explanation
✓ Answer: B — Nitrogen fixation by Rhizobium bacteria
Award 1 mark for identifying that legumes like black-eyed peas have root nodules containing Rhizobium bacteria that convert atmospheric nitrogen into ammonia/nitrates, enriching the soil for subsequent crops. A is incorrect — denitrification removes nitrogen from soil. C is incorrect — nitrification converts ammonia to nitrates but does not add new nitrogen. D is incorrect — ammonification recycles existing nitrogen but does not explain the legume effect.
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CXC CSEC Integrated Science: Nutrient Cycles: Carbon Cycle, Nitrogen Cycle and Water Cycle FAQ

How many CXC CSEC Integrated Science questions on Nutrient Cycles: Carbon Cycle, Nitrogen Cycle and Water Cycle are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Nutrient Cycles: Carbon Cycle, Nitrogen Cycle and Water Cycle for CXC CSEC Integrated Science, 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 CXC 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 CXC CSEC students preparing for Integrated Science?
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 Nutrient Cycles: Carbon Cycle, Nitrogen Cycle and Water Cycle practice with other Integrated Science topics or even switch to a totally different CXC 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 Nutrient Cycles: Carbon Cycle, Nitrogen Cycle and Water Cycle questions aligned to the official CXC CSEC Integrated Science syllabus?
Every question is written against the published CXC CSEC Integrated Science specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CXC 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 CXC.
How is Nutrient Cycles: Carbon Cycle, Nitrogen Cycle and Water Cycle typically tested on CXC CSEC Integrated Science papers?
Nutrient Cycles: Carbon Cycle, Nitrogen Cycle and Water Cycle appears across multiple question types on real CXC CSEC Integrated Science 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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