What is the effect of smoking on gas exchange?

Q: How do I try a free CIE Biology question?

Just tap any of the four options on this page — no signup, no card, nothing to install. You'll see the correct answer and a full mark-scheme-style explanation within a second. Each visit shows a fresh randomly-picked question from the live CIE IGCSE Biology bank, so you can keep refreshing to try different ones before deciding whether to create a free account for daily access.

Q: Is Kramizo really free for CIE Biology students?

Yes — completely free. Every student gets 45 questions a day on the free plan, across any board and any subject, with no card required and no trial countdown. Kramizo's optional Pro plan removes the daily cap and adds analytics, but the free plan is genuinely free forever. We make money from the small percentage of students who choose to upgrade — not from selling data or ads.

Q: Are the Biology questions aligned to the CIE IGCSE syllabus?

Every question is written against the published CIE IGCSE Biology syllabus and reviewed for accuracy before being added to the bank. We match the command words (state, describe, explain, evaluate), mark allocations, and difficulty tier you'll see on real CIE past papers. Explanations are written in the style of official examiner mark schemes so students learn exactly what marks are being awarded for.

Question

What is the effect of smoking on gas exchange?

Accepted Answer

Tar damages alveoli (reducing surface area), mucus builds up, and cilia are destroyed — Smoking: tar coats alveoli and causes inflammation, reducing surface area (emphysema). Cilia destroyed → mucus accumulates → chronic bronchitis. Also increases cancer risk.

Answer

Tar damages alveoli (reducing surface area), mucus builds up, and cilia are destroyed

Answer

It only affects the mouth

Answer

It improves gas exchange

Answer

It has no effect

One real Biology question.No signup. 30 seconds.

One real Biology question.
No signup. 30 seconds.