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HomeCXC CSEC BiologyGas Exchange in Plants – Stomata and Lenticels
CXC · CSEC · Biology

Gas Exchange in Plants – Stomata and Lenticels
Practice Questions

20 CXC CSEC Biology questions on Gas Exchange in Plants – Stomata and Lenticels, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Gas Exchange in Plants – Stomata and Lenticels

Question 1 · 1 mark · Difficulty 1/3

A student in Barbados observed the underside of a sugar cane leaf under a microscope and noticed small openings surrounded by pairs of curved cells. What is the name of these openings?

  1. Lenticels
  2. Stomata
  3. Root hairs
  4. Cuticles
Show answer & explanation
✓ Answer: BStomata
Award 1 mark for identifying stomata as the small openings on leaf surfaces surrounded by guard cells. A is incorrect — lenticels are found on stems and bark, not leaf surfaces. C is incorrect — root hairs are extensions of root epidermal cells for absorption. D is incorrect — the cuticle is a waxy layer covering the leaf surface, not an opening.
Question 2 · 1 mark · Difficulty 1/3

During a Biology field trip in Trinidad, students examined the bark of a mango tree and observed small raised spots. Which gas exchange structure were they observing?

  1. Stomata
  2. Guard cells
  3. Lenticels
  4. Chloroplasts
Show answer & explanation
✓ Answer: CLenticels
Award 1 mark for identifying lenticels as the gas exchange structures found on woody stems and bark. A is incorrect — stomata are found primarily on leaves, not bark. B is incorrect — guard cells surround stomata, not found on bark. D is incorrect — chloroplasts are organelles inside cells, not visible structures on bark.
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CXC CSEC Biology: Gas Exchange in Plants – Stomata and Lenticels FAQ

How many CXC CSEC Biology questions on Gas Exchange in Plants – Stomata and Lenticels are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Gas Exchange in Plants – Stomata and Lenticels 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 Gas Exchange in Plants – Stomata and Lenticels 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 Gas Exchange in Plants – Stomata and Lenticels 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 Gas Exchange in Plants – Stomata and Lenticels typically tested on CXC CSEC Biology papers?
Gas Exchange in Plants – Stomata and Lenticels 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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