Blood vessels and the Daphnia heart-rate practical Quiz
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5 questions, one answer each
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1. Which blood vessel has walls of only one layer of cells?
- A. Artery
- B. Vein
- C. Arteriole
- D. Capillary
2. Daphnia is placed in a caffeine solution and 62 beats are counted in 20 s. What is its heart rate?
- A. 186 beats per minute
- B. 124 beats per minute
- C. 62 beats per minute
- D. 310 beats per minute
3. Which feature of veins stops blood flowing backwards?
- A. Elastic fibres
- B. A narrow lumen
- C. A thick muscular wall
- D. Valves
4. Which is a sensible way of improving the reliability of the Daphnia investigation?
- A. Use only one Daphnia per concentration
- B. Use the same temperature and repeat with several Daphnia to find a mean
- C. Change the temperature for each solution
- D. Count beats for different times in each solution
5. Why do some people consider the use of Daphnia in research to be ethically more acceptable than the use of mice?
- A. Daphnia are larger
- B. Daphnia cannot be harmed
- C. Daphnia have a simpler nervous system and are less likely to feel pain
- D. Daphnia are vertebrates