Required Practical: Ecosystems (AQA GCSE Biology): Flashcards
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Practise the cards
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Practise the cards
15 cards from this deck
Transect definition
Transect definition
Straight line along which ecological measurements taken at regular intervals
Quadrat definition
Quadrat definition
Square frame (1m x 1m) used to isolate a sample area for study
Distribution (ecology)
Distribution (ecology)
Way organisms are spread across an area
Abundance (ecology)
Abundance (ecology)
Number of individuals of a species in a given area
Purpose of using transects
Purpose of using transects
Study how distribution of organisms changes across a habitat
How often to place quadrats along transect
How often to place quadrats along transect
Regular intervals, e.g. every 2 metres
Purpose of using quadrats
Purpose of using quadrats
Estimate population size or abundance in a specific area
How to place quadrats
How to place quadrats
Randomly within study area to avoid bias
Why repeat quadrat sampling
Why repeat quadrat sampling
Get reliable average from different parts of habitat
Mean in ecological data
Mean in ecological data
Average number of organisms per quadrat
Mode in ecological data
Mode in ecological data
Most common number of organisms found in quadrats
Median in ecological data
Median in ecological data
Middle value when organism numbers arranged in order
Why use random sampling
Why use random sampling
To avoid bias
Environmental factors affecting distribution
Environmental factors affecting distribution
Light, temperature, and moisture
Applications of transect/quadrat practical
Applications of transect/quadrat practical
Understanding distribution across environments, studying effects of pollution/habitat destruction, informing conservation efforts