RP10: Investigating Simple Animal Responses

Question 1

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

Answer 1

By setting up chambers in different quadrants with different environmental conditions:
dark + dry
Dark + damp
Light + dry
Light + damp

Organisms will move to quadrant they find favourable

Question 2

What factors must be controlled when repeating experiment

Answer 2

Number of animals

Enviro conditions

Time allowed for animals to choose

Question 3

Which stats test is used to analyse results of this practical and why

Answer 3

Chi squared test

It compares expected and observed values, and tests if there’s a significant difference

Question 4

What’s the conclusion drawn if the calculated value is greater than the critical value

Answer 4

Reject null hypothesis

Less than 5% probability that difference is due to chance alone

There’s a statistically significant difference between expected and observed values

Question 5

What do animals do when they’re in unfavourable enviros

Answer 5

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

Question 6

State hazard and precaution involved in this practical

Answer 6

Live organisms used are a biohazard

Wash hands after handling