Practical 10

Question 1

how can a choice chamber be used to measure the favourable environment of a small organism

Answer 1

by setting up chamber in different quadrants with different environmental conditions
organisms will move to the quadrant they find favourable

Question 2

what factors must be controlled when repeating the experiment

Answer 2

number of animals
environmental conditions
time allowed for animals to choose

Question 3

which statistical test is used to analyse the results of this practical and why?

Answer 3

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

Question 4

what is the conclusion drawn calculated value is greater than the critical value

Answer 4

null hypothesis is rejected.
less than 5% probability that the difference is due to chance alone
there is a statistically significant difference between the expected and observed values

Question 5

what do animals do when they are in unfavourable environments

Answer 5

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

Question 6

state the hard and precaution involved in this practical

Answer 6

the live organisms used are a biohazard. wash hands after handling