Cell Size & Exchange — Drills · Grade 10 Science
Chapter: Cells, Membranes & ExchangeWhat these drills covers
By the end of Cell Size & Exchange you should be able to:
- I can calculate a cube’s surface-area-to-volume ratio.
- I can explain why exchange depends on size, shape, and transport mechanisms.
2 questions, written answer, each with a worked explanation.
Vocabulary used: surface area, volume, diffusion distance.
Problem 1
Would a larger cell necessarily exchange enough oxygen just because it has a larger total surface?
Answer and explanation
No. Its volume and demand may grow faster than surface area; gradients, permeability, and transport also matter.
Problem 2
Explain why multicellular organisms can grow large while their cells stay relatively small.
Answer and explanation
Many cells share the work, while specialized exchange and transport structures move materials between the environment and cells.