CAIE IGCSE Biology 13.1.9 Importance of excretion
Practise explaining why metabolic waste must be removed, with urea as the key toxic product that must be excreted.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- state that urea must be excreted because it is toxic or harmful
- explain excretion as removal of metabolic waste or excess harmful substances
13.1.9—Importance of excretion question 1
[Maximum number: 2]
The lungs and the kidneys are part of the excretory system of mammals.
State the name of one excretory substance, that is removed by the kidneys, that contains nitrogen.
Explain why it is excreted.
name
explanation
urea ;
toxic / poisonous / harmful / waste / AW ;
A ammonia / ammonium / creatin(ine)
/ uric acid / urine
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