GCSE Biology Required Practical 9

A lesson / revision PowerPoint covering all information needed and containing informative slides and practise questions

Required Practical 9 - To measure the population size of a common species in a habitat and use sampling techniques to investigate the effect of a factor on the distribution of this species

This powerpoint covers AT 1 (use appropriate apparatus to record length and area), AT 3 (use transect lines and quadrats to measure distribution of a species),
AT 4 (safe and ethical use of organisms and response to a factor in the environment), AT 6 (application of appropriate sampling techniques to investigate the distribution and abundance of organisms in an ecosystem via direct use in the field), AT 8 (use of appropriate techniques in more complex contexts including continuous sampling in an investigation) and includes all practical and mathmatical skills required.

The powerpoint covers:

Background on Ecology and ecosystems and using quadrats & transects
Aim
Required apparatus
A suitable method to investigate population size and investigate the effect of a factor on the distribution of a species
Appropraite sampling techniques e.g. random & systematic and when to use them
How to calculate percentage cover
How to calculate mean, median, mode and range
How to calculate area of irregular shapes to estimate population size
How to work with quadrats of different sizes in exam questions
How to calculate percentage change
Past paper exam questions
Summary