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HomeCXC CSEC ChemistryNatural Polymers: Proteins, Carbohydrates and Rubber
CXC · CSEC · Chemistry

Natural Polymers: Proteins, Carbohydrates and Rubber
Practice Questions

20 CXC CSEC Chemistry questions on Natural Polymers: Proteins, Carbohydrates and Rubber, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Natural Polymers: Proteins, Carbohydrates and Rubber

Question 1 · 1 mark · Difficulty 2/3

Which test would give a positive result for the presence of protein in a sample of cooked saltfish?

  1. Add iodine solution and observe for a blue-black colour
  2. Add Benedict's solution and heat; observe for a brick-red precipitate
  3. Add sodium hydroxide solution and copper sulfate solution; observe for a purple colour
  4. Add ethanol and shake; observe for a cloudy white emulsion
Show answer & explanation
✓ Answer: CAdd sodium hydroxide solution and copper sulfate solution; observe for a purple colour
Award 1 mark for correct identification. The biuret test (sodium hydroxide + copper sulfate) produces a purple/violet colour in the presence of protein. A is incorrect as this is the test for starch. B is incorrect as this is the test for reducing sugars. D is incorrect as this is the emulsion test for lipids.
Question 2 · 1 mark · Difficulty 2/3

A factory in Trinidad processes sugar cane to produce raw sugar. The main carbohydrate stored in sugar cane stems is:

  1. Glucose
  2. Sucrose
  3. Starch
  4. Cellulose
Show answer & explanation
✓ Answer: BSucrose
Award 1 mark for correct identification. Sugar cane stores sucrose (a disaccharide) as its primary carbohydrate in the stem, which is extracted during sugar processing. A is incorrect because glucose is a monosaccharide found in lower concentrations. C is incorrect because starch is the storage carbohydrate in plants like potato and cassava, not sugar cane. D is incorrect because cellulose is a structural carbohydrate in cell walls, not a storage form.
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CXC CSEC Chemistry: Natural Polymers: Proteins, Carbohydrates and Rubber FAQ

How many CXC CSEC Chemistry questions on Natural Polymers: Proteins, Carbohydrates and Rubber are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Natural Polymers: Proteins, Carbohydrates and Rubber for CXC CSEC Chemistry, 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 Chemistry?
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 Natural Polymers: Proteins, Carbohydrates and Rubber practice with other Chemistry 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 Natural Polymers: Proteins, Carbohydrates and Rubber questions aligned to the official CXC CSEC Chemistry syllabus?
Every question is written against the published CXC CSEC Chemistry 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 Natural Polymers: Proteins, Carbohydrates and Rubber typically tested on CXC CSEC Chemistry papers?
Natural Polymers: Proteins, Carbohydrates and Rubber appears across multiple question types on real CXC CSEC Chemistry 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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