CAIE IGCSE Biology 8.2.2 Root Hair Surface Area
Practise explaining why root hair projections give epidermal cells a large soil-contact surface for absorbing water and mineral ions efficiently.
- Syllabus
- 2026–2028
- Course
- Biology 0610
Exam points
- state that root hair projections increase the surface area of root epidermal cells
- link larger soil contact area to faster uptake of water or mineral ions
- choose large surface area over distractors such as chloroplasts or cell-sap volume
8.2.2—Large surface area of root hairs question 1
[Maximum number: 1]
How is the structure of root hair cells related to their function?
A
They have chloroplasts for photosynthesis.
B
Their cell wall is partially permeable to absorb water by osmosis.
C
They have a large surface area to increase the rate of mineral ion uptake.
D
Both the cell wall and cell membrane control the active uptake of mineral ions.
C
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