required practical 10

Question 1

what response can a choice chamber demonstrate?

Answer 1

kinesis

Question 2

why can a choice chamber be used to demonstrate kinesis?

Answer 2

4 conditions can be set up (dark + dry, dark + damp, light + damp and light + dry)
the animal (e.g woodlice) will move to the most favourable condition

Question 3

what factors must be controlled in this experiment?

Answer 3

number of animals
environemental conditions
time given for animals to choose

Question 4

what statistical test is used to analyse the results of this practical?

Answer 4

chi-squared test because it compares the expected and observed values and tests if there is a significant difference

Question 5

what do animals do when they are in unfavourable conditions?

Answer 5

they move faster and change direction quickly to increase their chances of survival

Question 6

method

Answer 6

1. set up a choice chamber to have four quadrants (d+dr, d+da, l+dr, l+da)
2. use dark paper or cardboard to block out light, use a wet paper towel to make damp areas and use a drying agent such as anhydrous calcium chloride to make dry areas
3. place 10 woodlice in the centre of the choice chamber using a spoon
4. leave for 10 minutes
5. record how many woodlice are in each quadrant
6. repeat by moving woodlice back to the middle

Question 7

what conditions do woodlice prefer?

Answer 7

dark and damp as they no longer move fast and change direction