Question 1 — IGCSE 0653 Mar 2023 Paper 12 Q1
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Correct answer: B
Cambridge IGCSE·Combined Sciences 0653·Biology
Excretion
Key knowledge — Excretion
Key facts & rules
- Excretion: removal of metabolic WASTE products (CO₂ from respiration, urea from protein breakdown).
- Egestion is NOT excretion — it is the removal of undigested food.
- Kidneys: filter blood (ultrafiltration), selectively reabsorb useful substances, produce urine.
- Urea: made in the liver from excess amino acids (deamination).
- Nephron stages: glomerular filtration → tubular reabsorption (glucose, amino acids, water) → secretion.
- ADH (antidiuretic hormone): increases water reabsorption in collecting duct → concentrated urine.
- Skin excretes water and salts in sweat (and small amounts of urea).
- Lungs excrete CO₂ and water vapour.
IGCSE Biology — Excretion
57 Cambridge IGCSE 0653 Combined Sciences past paper questions on excretion, across Theory, Multiple Choice and Alternative to Practical.
About Excretion on IGCSE 0653
Excretion is the removal of metabolic waste products. The kidneys filter the blood to produce urine, removing urea (made in the liver from excess amino acids) and excess water and ions.
What's covered:
- Excretion vs egestion
- Kidney: ultrafiltration and selective reabsorption
- Urea production in the liver
- Role of the skin in excretion (sweat)
- Osmoregulation
Multiple choice
Excretion — Core MCQ39 · Paper 1
Question 2 — IGCSE 0653 Mar 2023 Paper 12 Q2
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Correct answer: C
Question 3 — IGCSE 0653 Mar 2023 Paper 12 Q3
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Correct answer: C
Question 4 — IGCSE 0653 Mar 2024 Paper 12 Q1
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Correct answer: B
Question 5 — IGCSE 0653 Mar 2024 Paper 12 Q2
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Correct answer: D
Question 6 — IGCSE 0653 Mar 2024 Paper 12 Q3
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Correct answer: C
Question 7 — IGCSE 0653 Mar 2024 Paper 12 Q4
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Correct answer: D
Question 8 — IGCSE 0653 May/Jun 2023 Paper 11 Q1
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Correct answer: C
Question 9 — IGCSE 0653 May/Jun 2023 Paper 12 Q1
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Correct answer: C
Question 10 — IGCSE 0653 May/Jun 2023 Paper 11 Q2
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Correct answer: A
Question 11 — IGCSE 0653 May/Jun 2023 Paper 12 Q2
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Correct answer: B
Question 12 — IGCSE 0653 May/Jun 2023 Paper 11 Q3
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Correct answer: B
Question 13 — IGCSE 0653 May/Jun 2023 Paper 12 Q3
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Correct answer: B
Question 14 — IGCSE 0653 May/Jun 2024 Paper 11 Q1
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Correct answer: A
Question 15 — IGCSE 0653 May/Jun 2024 Paper 12 Q1
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Correct answer: D
Question 16 — IGCSE 0653 May/Jun 2024 Paper 11 Q2
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Correct answer: D
Question 17 — IGCSE 0653 May/Jun 2024 Paper 12 Q2
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Correct answer: D
Question 18 — IGCSE 0653 May/Jun 2024 Paper 11 Q3
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Correct answer: A
Question 19 — IGCSE 0653 May/Jun 2024 Paper 12 Q3
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Correct answer: A
Question 20 — IGCSE 0653 May/Jun 2024 Paper 12 Q4
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Correct answer: A
Question 21 — IGCSE 0653 May/Jun 2024 Paper 13 Q15
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Correct answer: C
Question 22 — IGCSE 0653 May/Jun 2024 Paper 13 Q16
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Correct answer: D
Question 23 — IGCSE 0653 May/Jun 2024 Paper 13 Q17
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Correct answer: A
Question 24 — IGCSE 0653 May/Jun 2024 Paper 13 Q18
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Correct answer: B
Question 25 — IGCSE 0653 May/Jun 2025 Paper 11 Q1
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Correct answer: C
Question 26 — IGCSE 0653 May/Jun 2025 Paper 12 Q1
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Correct answer: C
Question 27 — IGCSE 0653 May/Jun 2025 Paper 13 Q1
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Correct answer: C
Question 28 — IGCSE 0653 May/Jun 2025 Paper 11 Q2
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Correct answer: C
Question 29 — IGCSE 0653 May/Jun 2025 Paper 12 Q2
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Correct answer: D
Question 30 — IGCSE 0653 May/Jun 2025 Paper 13 Q2
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Correct answer: C
Question 31 — IGCSE 0653 May/Jun 2025 Paper 11 Q3
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Correct answer: D
Question 32 — IGCSE 0653 May/Jun 2025 Paper 12 Q3
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Correct answer: A
Question 33 — IGCSE 0653 May/Jun 2025 Paper 13 Q3
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Correct answer: C
Question 34 — IGCSE 0653 May/Jun 2025 Paper 11 Q4
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Correct answer: D
Question 35 — IGCSE 0653 May/Jun 2025 Paper 11 Q5
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Correct answer: B
Question 36 — IGCSE 0653 Oct/Nov 2023 Paper 11 Q1
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Correct answer: B
Question 37 — IGCSE 0653 Oct/Nov 2023 Paper 11 Q2
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Correct answer: A
Question 38 — IGCSE 0653 Oct/Nov 2023 Paper 11 Q3
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Correct answer: C
Question 39 — IGCSE 0653 Oct/Nov 2023 Paper 11 Q4
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Correct answer: C
Excretion — Extended MCQ16 · Paper 2
Question 1 — IGCSE 0653 Mar 2025 Paper 22 Q1
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Correct answer: B
Question 2 — IGCSE 0653 Mar 2025 Paper 22 Q2
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Correct answer: D
Question 3 — IGCSE 0653 Mar 2025 Paper 22 Q3
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Correct answer: B
Question 4 — IGCSE 0653 May/Jun 2023 Paper 21 Q1
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Correct answer: C
Question 5 — IGCSE 0653 May/Jun 2023 Paper 22 Q1
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Correct answer: C
Question 6 — IGCSE 0653 May/Jun 2023 Paper 21 Q2
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Correct answer: A
Question 7 — IGCSE 0653 May/Jun 2023 Paper 22 Q2
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Correct answer: B
Question 8 — IGCSE 0653 May/Jun 2023 Paper 21 Q3
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Correct answer: D
Question 9 — IGCSE 0653 May/Jun 2023 Paper 22 Q3
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Correct answer: A
Question 10 — IGCSE 0653 May/Jun 2024 Paper 23 Q1
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Correct answer: C
Question 11 — IGCSE 0653 May/Jun 2024 Paper 23 Q2
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Correct answer: A
Question 12 — IGCSE 0653 May/Jun 2025 Paper 22 Q1
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Correct answer: C
Question 13 — IGCSE 0653 May/Jun 2025 Paper 22 Q2
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Correct answer: B
Question 14 — IGCSE 0653 May/Jun 2025 Paper 22 Q3
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Correct answer: A
Question 15 — IGCSE 0653 Oct/Nov 2023 Paper 21 Q1
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Correct answer: B
Question 16 — IGCSE 0653 Oct/Nov 2023 Paper 21 Q2
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Correct answer: B
Alternative to practical
Excretion — ATP2 questions
Exercise 1 — IGCSE 0653 Oct/Nov 2023 Paper 63 Q1
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factor 1 light
Exercise 2 — IGCSE 0653 Oct/Nov 2023 Paper 63 Q2
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one mark from each section and any two other marking points
All Excretion questions in this collection
| Type | Level | Paper | Session | Q# | Marks | Answer / key |
|---|---|---|---|---|---|---|
| ATP | Extended | Paper 63 | Oct/Nov 2023 | Q1 | 7 marks | factor 1 light |
| ATP | Extended | Paper 63 | Oct/Nov 2023 | Q2 | 7 marks | one mark from each section and any two other marking points |
| MCQ | Core | Paper 12 | Mar 2023 | Q1 | 1 mark | B |
| MCQ | Core | Paper 12 | Mar 2023 | Q2 | 1 mark | C |
| MCQ | Core | Paper 12 | Mar 2023 | Q3 | 1 mark | C |
| MCQ | Core | Paper 12 | Mar 2024 | Q1 | 1 mark | B |
| MCQ | Core | Paper 12 | Mar 2024 | Q2 | 1 mark | D |
| MCQ | Core | Paper 12 | Mar 2024 | Q3 | 1 mark | C |
| MCQ | Core | Paper 12 | Mar 2024 | Q4 | 1 mark | D |
| MCQ | Core | Paper 11 | May/Jun 2023 | Q1 | 1 mark | C |
| MCQ | Core | Paper 12 | May/Jun 2023 | Q1 | 1 mark | C |
| MCQ | Core | Paper 11 | May/Jun 2023 | Q2 | 1 mark | A |
| MCQ | Core | Paper 12 | May/Jun 2023 | Q2 | 1 mark | B |
| MCQ | Core | Paper 11 | May/Jun 2023 | Q3 | 1 mark | B |
| MCQ | Core | Paper 12 | May/Jun 2023 | Q3 | 1 mark | B |
| MCQ | Core | Paper 11 | May/Jun 2024 | Q1 | 1 mark | A |
| MCQ | Core | Paper 12 | May/Jun 2024 | Q1 | 1 mark | D |
| MCQ | Core | Paper 11 | May/Jun 2024 | Q2 | 1 mark | D |
| MCQ | Core | Paper 12 | May/Jun 2024 | Q2 | 1 mark | D |
| MCQ | Core | Paper 11 | May/Jun 2024 | Q3 | 1 mark | A |
| MCQ | Core | Paper 12 | May/Jun 2024 | Q3 | 1 mark | A |
| MCQ | Core | Paper 12 | May/Jun 2024 | Q4 | 1 mark | A |
| MCQ | Core | Paper 13 | May/Jun 2024 | Q15 | 1 mark | C |
| MCQ | Core | Paper 13 | May/Jun 2024 | Q16 | 1 mark | D |
| MCQ | Core | Paper 13 | May/Jun 2024 | Q17 | 1 mark | A |
| MCQ | Core | Paper 13 | May/Jun 2024 | Q18 | 1 mark | B |
| MCQ | Core | Paper 11 | May/Jun 2025 | Q1 | 1 mark | C |
| MCQ | Core | Paper 12 | May/Jun 2025 | Q1 | 1 mark | C |
| MCQ | Core | Paper 13 | May/Jun 2025 | Q1 | 1 mark | C |
| MCQ | Core | Paper 11 | May/Jun 2025 | Q2 | 1 mark | C |
| MCQ | Core | Paper 12 | May/Jun 2025 | Q2 | 1 mark | D |
| MCQ | Core | Paper 13 | May/Jun 2025 | Q2 | 1 mark | C |
| MCQ | Core | Paper 11 | May/Jun 2025 | Q3 | 1 mark | D |
| MCQ | Core | Paper 12 | May/Jun 2025 | Q3 | 1 mark | A |
| MCQ | Core | Paper 13 | May/Jun 2025 | Q3 | 1 mark | C |
| MCQ | Core | Paper 11 | May/Jun 2025 | Q4 | 1 mark | D |
| MCQ | Core | Paper 11 | May/Jun 2025 | Q5 | 1 mark | B |
| MCQ | Core | Paper 11 | Oct/Nov 2023 | Q1 | 1 mark | B |
| MCQ | Core | Paper 11 | Oct/Nov 2023 | Q2 | 1 mark | A |
| MCQ | Core | Paper 11 | Oct/Nov 2023 | Q3 | 1 mark | C |
| MCQ | Core | Paper 11 | Oct/Nov 2023 | Q4 | 1 mark | C |
| MCQ | Extended | Paper 22 | Mar 2025 | Q1 | 1 mark | B |
| MCQ | Extended | Paper 22 | Mar 2025 | Q2 | 1 mark | D |
| MCQ | Extended | Paper 22 | Mar 2025 | Q3 | 1 mark | B |
| MCQ | Extended | Paper 21 | May/Jun 2023 | Q1 | 1 mark | C |
| MCQ | Extended | Paper 22 | May/Jun 2023 | Q1 | 1 mark | C |
| MCQ | Extended | Paper 21 | May/Jun 2023 | Q2 | 1 mark | A |
| MCQ | Extended | Paper 22 | May/Jun 2023 | Q2 | 1 mark | B |
| MCQ | Extended | Paper 21 | May/Jun 2023 | Q3 | 1 mark | D |
| MCQ | Extended | Paper 22 | May/Jun 2023 | Q3 | 1 mark | A |
| MCQ | Extended | Paper 23 | May/Jun 2024 | Q1 | 1 mark | C |
| MCQ | Extended | Paper 23 | May/Jun 2024 | Q2 | 1 mark | A |
| MCQ | Extended | Paper 22 | May/Jun 2025 | Q1 | 1 mark | C |
| MCQ | Extended | Paper 22 | May/Jun 2025 | Q2 | 1 mark | B |
| MCQ | Extended | Paper 22 | May/Jun 2025 | Q3 | 1 mark | A |
| MCQ | Extended | Paper 21 | Oct/Nov 2023 | Q1 | 1 mark | B |
| MCQ | Extended | Paper 21 | Oct/Nov 2023 | Q2 | 1 mark | B |