The photograph below shows an earthworm, Lumbricus terrestris.
Earthworms live in soil and feed on organic matter. Earthworms display a rapid reflex
action to retreat from predators.
When touched, an earthworm responds by quickly reducing its body length.
Describe an experiment to compare the effect of repeated touch stimulation of
earthworms in bright light and in dim light.
1. dependent variable identified as heart rate ;
2. both pesticides used ;
3. allow Daphnia to {acclimatise / equilibrate /
eq} (in the pesticide) ;
4. description of how to obtain quantitative
results ;
5. credit one detail of methodology ;
6. take several readings and calculate a mean ;