Investigating

Question 1

Describe the method that could be used to determine the main percentage cover of algae on a coral reef.

Answer 1

Random sampling uses a random number generator to find coordinates and sample use a large number of quadrats divide the total number percentage by the number of quadrats

Question 2

The mark released and recapture method can be used to estimate that the size of a fish population explain how

Answer 2

Capture sample mark and release ensure marking is not harmful to the fish and allowed time for the fish to distribute before collecting a second sample. 

N1 x N2/number marked in sample 2

Question 3

Suggest why the mark release three capture method can produce unreliable results in very large lakes

Answer 3

Unlikely fish distributes randomly