18-19 - Distribution of Organisms Flashcards
1
Q
What environmental factors may decide which organisms are found in an area?
A
Temperature Water O2/CO2 Nutrients Light
2
Q
What is a quadrat?
A
A square frame
3
Q
How do you use a quadrat?
A
Place it randomly on the ground in the sample area and count the organisms in the square
Repeat, then work out the mean
4
Q
What is a transect?
A
A line through an area
Quadrats along it
5
Q
How do you make results reliable?
A
Use a large sample size - lots of quadrats/transects
6
Q
How do you keep results valid?
A
Random samples
Control variables
7
Q
What does abiotic mean?
A
A factor which is non-living
8
Q
What does biotic mean?
A
A factor which is living
