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HomeCXC CSEC Integrated ScienceExcretion in Humans: Kidneys and Skin
CXC · CSEC · Integrated Science

Excretion in Humans: Kidneys and Skin
Practice Questions

20 CXC CSEC Integrated Science questions on Excretion in Humans: Kidneys and Skin, each with instant feedback and a full examiner-style mark scheme.

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Question 1 · 1 mark · Difficulty 1/3

Which of the following is the functional unit of the kidney?

  1. Ureter
  2. Nephron
  3. Bladder
  4. Renal pelvis
Show answer & explanation
✓ Answer: BNephron
Award 1 mark for identifying the nephron as the functional unit of the kidney. A is incorrect — the ureter is a tube that transports urine from the kidney to the bladder. C is incorrect — the bladder stores urine. D is incorrect — the renal pelvis collects urine from the nephrons before it enters the ureter.
Question 2 · 1 mark · Difficulty 1/3

During the process of ultrafiltration in the kidney, which of the following substances is NOT normally filtered from the blood into the Bowman's capsule?

  1. Glucose
  2. Urea
  3. Proteins
  4. Water
Show answer & explanation
✓ Answer: CProteins
Award 1 mark for identifying that proteins are too large to pass through the capillary walls of the glomerulus during ultrafiltration. A is incorrect — glucose is small enough to be filtered and is later reabsorbed. B is incorrect — urea is filtered and excreted. D is incorrect — water is freely filtered.
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CXC CSEC Integrated Science: Excretion in Humans: Kidneys and Skin FAQ

How many CXC CSEC Integrated Science questions on Excretion in Humans: Kidneys and Skin are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Excretion in Humans: Kidneys and Skin for CXC CSEC Integrated Science, 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 Integrated Science?
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 Excretion in Humans: Kidneys and Skin practice with other Integrated Science 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 Excretion in Humans: Kidneys and Skin questions aligned to the official CXC CSEC Integrated Science syllabus?
Every question is written against the published CXC CSEC Integrated Science 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 Excretion in Humans: Kidneys and Skin typically tested on CXC CSEC Integrated Science papers?
Excretion in Humans: Kidneys and Skin appears across multiple question types on real CXC CSEC Integrated Science 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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