Surface area to volume ratio Quiz
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5 questions, one answer each
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1. What is the SA:V of a cube of side 5 mm?
- A. 0.6 mm⁻¹
- B. 1.2 mm⁻¹
- C. 1.5 mm⁻¹
- D. 6 mm⁻¹
2. Why can a flatworm exchange oxygen by diffusion alone?
- A. It has a small SA:V
- B. It has a thick body wall
- C. It has a short diffusion distance and a large SA:V
- D. It has a circulatory system
3. What happens to SA:V as an organism increases in size?
- A. It stays the same
- B. It increases
- C. It becomes zero
- D. It decreases
4. Which is NOT a feature of an efficient gas exchange surface?
- A. Large surface area
- B. Thin surface
- C. Steep concentration gradient
- D. Long diffusion distance
5. Why do large active animals need a mass transport system?
- A. Diffusion alone is too slow to supply cells far from the surface
- B. Their cells do not respire
- C. Diffusion cannot occur across membranes
- D. Their SA:V is very large