In the left Petri dish is ice water; in the right Petri dish is 60°C hot water. Then you put the bowl with one end on the cold Petri dish, with the other end on the hot Petri dish. After that you measure the temperature with a laser thermometer. If there is a temperature difference of 30°C you can put the animals into the bowl and you look at the animals in which direction they move.
The picture shows the bowl with the 2 Petri dishes.
The chart shows how the temperature is changing.
Observation of the animals
The animals were put at the zero point into the bowl and rested there for the first 10 seconds. After the 10 seconds the animals moved very quickly in colder areas of the bowl.
We wrote every 5 seconds down on which place the animals had been.
After 35 seconds all animals were in the colder areas of the bowl and rested there for the rest of the time.
The chart shows where the animals have been in the bowl at different times.
The picture shows the bowl with the 2 Petri dishes.
The chart shows how the temperature is changing.
Observation of the animals
The animals were put at the zero point into the bowl and rested there for the first 10 seconds. After the 10 seconds the animals moved very quickly in colder areas of the bowl.
We wrote every 5 seconds down on which place the animals had been.
After 35 seconds all animals were in the colder areas of the bowl and rested there for the rest of the time.
The picture shows the animals in the bowl.
The chart shows where the animals have been in the bowl at different times.
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