At a sugar factory in Jamaica, workers noticed that stored molasses in poorly sealed containers began to smell of alcohol. Which organisms were most likely responsible for this change?

Q: How do I try a free CXC Integrated Science 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 CXC CSEC Integrated Science 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 CXC Integrated Science 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 Integrated Science questions aligned to the CXC CSEC syllabus?

Every question is written against the published CXC CSEC Integrated Science 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 CXC past papers. Explanations are written in the style of official examiner mark schemes so students learn exactly what marks are being awarded for.

Question

At a sugar factory in Jamaica, workers noticed that stored molasses in poorly sealed containers began to smell of alcohol. Which organisms were most likely responsible for this change?

Accepted Answer

Yeast carrying out anaerobic respiration — Award 1 mark for identifying yeast and anaerobic respiration/fermentation. Yeast converts sugars in molasses to ethanol (alcohol) and CO₂ under low oxygen conditions. A is incorrect — aerobic respiration does not produce alcohol. C is incorrect — moulds do not photosynthesise. D is incorrect — viruses cannot carry out metabolic processes independently.

Answer

Viruses carrying out fermentation

Answer

Yeast carrying out anaerobic respiration

Answer

Bacteria carrying out aerobic respiration

Answer

Moulds carrying out photosynthesis

One real Integrated Science question.No signup. 30 seconds.

One real Integrated Science question.
No signup. 30 seconds.