dirt on populations and ecology test

Question 1

why is it more suitable to do percentage cover for algae rather than frequency (1 mark)

Answer 1

individuals organism are not identifiable

Question 2

describe how you would collect samples to ensure they were representative of the habitats being investigated and could be compared with each other (3 marks)

Answer 2

• random
• random number generator
• same quadrat size/ same area disturbed/ same width of opening of net

Question 3

explain 2 advantages for a farmer of removing hedgerows (2 marks)

Answer 3

• increased yield of crop resulting in more profit for farmer
• source of pests of crop so removing hedgerows prevents them from eating crop
• source of weeds that are in competition with crop plant removing them means there is less competition for the crop meaning they have greater access to resources
• hedgerows have to be maintained so removing them saves time

Question 4

give 2 biological benefits of replanting hedgerows (2 marks)

Answer 4

• increased biodiversity of field
• source of food for animals
• prevent leaching