Core 1: Heart Rate

Question 1

Outline method

Answer 1

1. Place daphnia on cavity slide
2. Place under light microscope and focus on heart
3. Drip caffeine solution into and wait 5 mins
4. Count heart beat 20 seconds (x3)

Question 2

Repeats

Answer 2

Repeat 10 times with different daphnia but same conc

Question 3

IV?

Answer 3

Caffeine concentration of solution

Question 4

DV

Answer 4

Beats per min

Question 5

Control variables

Answer 5

1. Size of daphnia
2. Temperature of solution
3. Volume of solution

Question 6

Ethical issues

Answer 6

1. Simple nervous system so do not experience pain like humans
2. Causes daphnia distress
3. Good because see through

Question 7

What do to with results

Answer 7

1. Calculate mean+ standard deviation
2. Plot graph
3. Observe positive/ negative correlation
4. Say if significant