A farmer in St. Elizabeth, Jamaica, tested the soil in his field and found it had a pH of 4.5. He wants to grow callaloo, which grows best in soil with a pH between 6.0 and 7.0. Which substance should he add to the soil to make it suitable for callaloo?

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

A farmer in St. Elizabeth, Jamaica, tested the soil in his field and found it had a pH of 4.5. He wants to grow callaloo, which grows best in soil with a pH between 6.0 and 7.0. Which substance should he add to the soil to make it suitable for callaloo?

Accepted Answer

Slaked lime — Award 1 mark for identifying that slaked lime (calcium hydroxide) is a base that neutralises acidic soil to raise the pH. A is incorrect — sulphuric acid would make the soil more acidic. C is incorrect — ammonium sulphate is a fertiliser that can make soil more acidic. D is incorrect — vinegar is an acid and would lower the pH further.

Answer

Vinegar

Answer

Slaked lime

Answer

Sulphuric acid

Answer

Ammonium sulphate

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

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