The table shows carbon dioxide emissions from different sources in a developing country. Which change would have the greatest effect on reducing total emissions?

Source | CO₂ emissions (million tonnes/year)
Transport | 45
Electricity generation | 120
Industry | 38
Agriculture | 12

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

The table shows carbon dioxide emissions from different sources in a developing country. Which change would have the greatest effect on reducing total emissions?

Accepted Answer

replacing coal-fired power stations with renewable energy sources — Award 1 mark for replacing coal-fired power stations with renewable energy sources. Electricity generation produces 120 million tonnes, the largest contribution. B is incorrect — agriculture produces only 12 million tonnes. C is incorrect — transport produces 45 million tonnes, less than electricity. D is incorrect — industry produces 38 million tonnes, less than electricity generation.

Answer

improving public transport to reduce car use

Answer

implementing carbon capture technology in factories

Answer

encouraging farmers to reduce cattle numbers

Answer

replacing coal-fired power stations with renewable energy sources

One real Biology question.No signup. 30 seconds.

One real Biology question.
No signup. 30 seconds.