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HomeCXC CSEC BiologyNutrient Cycles: Carbon Cycle and Nitrogen Cycle
CXC · CSEC · Biology

Nutrient Cycles: Carbon Cycle and Nitrogen Cycle
Practice Questions

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

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Try 2 sample questions on Nutrient Cycles: Carbon Cycle and Nitrogen Cycle

Question 1 · 1 mark · Difficulty 1/3

Which process is responsible for returning carbon dioxide to the atmosphere during the carbon cycle?

  1. Photosynthesis by green plants
  2. Transpiration by plant leaves
  3. Nitrogen fixation by bacteria
  4. Respiration by living organisms
Show answer & explanation
✓ Answer: DRespiration by living organisms
Respiration by all living organisms breaks down organic compounds and releases CO₂ back into the atmosphere, completing a key step in the carbon cycle. Photosynthesis removes CO₂ from the atmosphere rather than returning it. Nitrogen fixation involves nitrogen gas, not carbon. Transpiration releases water vapour, not carbon dioxide.
Question 2 · 1 mark · Difficulty 1/3

In the nitrogen cycle, which type of bacteria converts ammonium ions (NH₄⁺) into nitrites (NO₂⁻)?

  1. Decomposing bacteria such as Bacillus
  2. Denitrifying bacteria such as Pseudomonas
  3. Nitrifying bacteria such as Nitrosomonas
  4. Nitrogen-fixing bacteria such as Rhizobium
Show answer & explanation
✓ Answer: CNitrifying bacteria such as Nitrosomonas
Nitrifying bacteria such as Nitrosomonas oxidise ammonium ions to nitrites in the process of nitrification. Denitrifying bacteria convert nitrates back to nitrogen gas. Rhizobium fixes atmospheric nitrogen into ammonia. Decomposing bacteria break down organic matter to release ammonium ions.
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CXC CSEC Biology: Nutrient Cycles: Carbon Cycle and Nitrogen Cycle FAQ

How many CXC CSEC Biology questions on Nutrient Cycles: Carbon Cycle and Nitrogen Cycle are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Nutrient Cycles: Carbon Cycle and Nitrogen Cycle for CXC CSEC 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 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 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 Nutrient Cycles: Carbon Cycle and Nitrogen Cycle practice with other Biology 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 and Nitrogen Cycle questions aligned to the official CXC CSEC Biology syllabus?
Every question is written against the published CXC CSEC Biology 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 and Nitrogen Cycle typically tested on CXC CSEC Biology papers?
Nutrient Cycles: Carbon Cycle and Nitrogen Cycle appears across multiple question types on real CXC CSEC 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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