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HomeCXC CSEC Integrated ScienceRespiration: Aerobic and Anaerobic
CXC · CSEC · Integrated Science

Respiration: Aerobic and Anaerobic
Practice Questions

20 CXC CSEC Integrated Science questions on Respiration: Aerobic and Anaerobic, 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 Respiration: Aerobic and Anaerobic.

Try 2 sample questions on Respiration: Aerobic and Anaerobic

Question 1 · 1 mark · Difficulty 2/3

A student in Trinidad placed germinating pigeon pea seeds in a sealed flask with a carbon dioxide indicator. After 24 hours, the indicator changed from red to yellow. What does this colour change indicate?

  1. Oxygen was released by the seeds
  2. Carbon dioxide was produced by the seeds
  3. Water vapour accumulated in the flask
  4. Nitrogen was absorbed by the seeds
Show answer & explanation
✓ Answer: BCarbon dioxide was produced by the seeds
Award 1 mark for identifying that the colour change from red to yellow indicates increased CO₂ concentration. A is incorrect — oxygen is consumed, not released, during respiration. C is incorrect — water vapour does not cause this specific colour change in CO₂ indicators. D is incorrect — nitrogen is not involved in respiration.
Question 2 · 1 mark · Difficulty 2/3

During the production of rum in Barbados, yeast is added to molasses in large fermentation tanks. Which word equation correctly represents the process occurring in these tanks?

  1. glucose → lactic acid + energy
  2. glucose → ethanol + carbon dioxide + energy
  3. glucose + oxygen → carbon dioxide + water + energy
  4. glucose → ethanol + water + energy
Show answer & explanation
✓ Answer: Bglucose → ethanol + carbon dioxide + energy
Award 1 mark for the correct word equation for alcoholic fermentation. A is incorrect — this represents anaerobic respiration in animal muscle cells. C is incorrect — this represents aerobic respiration. D is incorrect — water is not a product of anaerobic respiration in yeast.
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20 questions · 25 min · free

CXC CSEC Integrated Science: Respiration: Aerobic and Anaerobic FAQ

How many CXC CSEC Integrated Science questions on Respiration: Aerobic and Anaerobic are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Respiration: Aerobic and Anaerobic 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 Respiration: Aerobic and Anaerobic 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 Respiration: Aerobic and Anaerobic 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 Respiration: Aerobic and Anaerobic typically tested on CXC CSEC Integrated Science papers?
Respiration: Aerobic and Anaerobic 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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