Gas exchange in animals and plants Quiz
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5 questions, one answer each
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1. Which structure of an insect delivers air closest to the respiring cells?
- A. Spiracle
- B. Trachea
- C. Operculum
- D. Tracheole
2. What is the advantage of counter-current flow in fish gills?
- A. Water moves faster over the gills
- B. Blood and water exchange gases in the same direction
- C. A concentration gradient is maintained along the whole lamella
- D. The gills have a smaller surface area
3. Which is a feature of the alveoli that shortens the diffusion distance?
- A. Walls one cell thick
- B. Rings of chitin
- C. Lined with cilia
- D. Stomata in the walls
4. Which is the main way in which sunken stomata in pits lined with hairs reduce water loss?
- A. They close at night
- B. They trap humid air, reducing the water potential gradient
- C. They stop carbon dioxide entering
- D. They increase the surface area for evaporation
5. A student dissects a locust and wants to act ethically. What should she do?
- A. Use a live locust anaesthetised with ether
- B. Use a locust that is already dead or humanely killed, from a reputable supplier
- C. Use any wild insect she finds, to avoid cost
- D. Remove the spiracles first so it feels no pain