required practical 12

Question 1

list 7 abiotic factors

Answer 1

light intensity, temperature, water supply, nurtient supply, humidity, wind speed and rainfall

Question 2

list 3 biotic factors

Answer 2

competition, predation and disease

Question 3

how is percentage cover calculated?

Answer 3

• use a quadrat with squares
• count how many squares the species is in
• only count a sqaure if more than half of the square is covered
• calculate percenatge of squares that are covered

Question 4

method

Answer 4

1. choose a 5x5m area to take samples from, use a random number generator to generate 10 sets of random coordinates
2. use two tape measures to create a set of axes off which coordinates can be read
3. place the quadrat at each of the coordiantes, placing the bottom left corner on the coordinates
4. record the percentage cover for the chosen species
5. at each coordinate, a measure of the independent variable should be taken

Question 5

graph

Answer 5

plot a graph of the percentage cover agaisnt the chosen independent variable (e.g light) and use a stats test to measure significance