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HomeCXC CSEC Integrated ScienceGaseous Exchange in Plants and Animals
CXC · CSEC · Integrated Science

Gaseous Exchange in Plants and Animals
Practice Questions

20 CXC CSEC Integrated Science questions on Gaseous Exchange in Plants and Animals, 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 Gaseous Exchange in Plants and Animals.

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Question 1 · 1 mark · Difficulty 1/3

Which structure in the leaf of a sugar cane plant allows carbon dioxide to enter for photosynthesis?

  1. Cuticle
  2. Stomata
  3. Palisade mesophyll
  4. Vascular bundle
Show answer & explanation
✓ Answer: BStomata
Stomata. Award 1 mark for identifying stomata as the entry point for carbon dioxide. A is incorrect — the cuticle is a waxy layer that reduces water loss. C is incorrect — palisade mesophyll is where photosynthesis mainly occurs but is not the entry point. D is incorrect — vascular bundles transport water and food, not gases.
Question 2 · 1 mark · Difficulty 2/3

A biology class in Trinidad investigated the breathing rate of students before and after exercise. Which of the following correctly explains why breathing rate increases during exercise?

  1. The body needs to remove excess oxygen from muscles
  2. Carbon dioxide levels in the blood decrease during exercise
  3. The body needs more oxygen for increased aerobic respiration
  4. Lactic acid causes the lungs to contract faster
Show answer & explanation
✓ Answer: CThe body needs more oxygen for increased aerobic respiration
The body needs more oxygen for increased aerobic respiration. Award 1 mark for linking increased oxygen demand to aerobic respiration in muscles. A is incorrect — oxygen is consumed, not removed. B is incorrect — carbon dioxide levels increase, not decrease. D is incorrect — lactic acid does not directly cause lung contraction; the medulla oblongata controls breathing rate in response to blood CO₂ levels.
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20 questions · 25 min · free

CXC CSEC Integrated Science: Gaseous Exchange in Plants and Animals FAQ

How many CXC CSEC Integrated Science questions on Gaseous Exchange in Plants and Animals are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Gaseous Exchange in Plants and Animals 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 Gaseous Exchange in Plants and Animals 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 Gaseous Exchange in Plants and Animals 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 Gaseous Exchange in Plants and Animals typically tested on CXC CSEC Integrated Science papers?
Gaseous Exchange in Plants and Animals 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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