The photograph below shows a locust, Locusta migratoria.
Locusts are found in many countries. They are active insects in warm conditions.
The locust obtains oxygen from the air by contracting and relaxing its abdomen.
This action moves air into and out of the body to ventilate it.
Describe an experiment to compare the rate of ventilation of locusts at two
different temperatures.
1. dependent variable identified as the ventilation rate / eq ;
2. two suitable temperatures stated (in range 0 to 50 °C) ;
3. description of how to obtain quantitative results for ventilation
rate ;
4. description of how temperature is controlled ;
5. {same/stated} time for exposure to each temperature to
acclimatise / eq ;
6. repeats (at each temperature) and calculate a mean ;
7. control of locust ;