15 questions, 15 minutes. Your score by area and the topic to fix first.
15:00 left · 0 of 15 answered
Question 11 mark
Which answer best meets the command 'Explain why the number of salmon fell after a dam was built across a river'?
Question 21 mark
A government introduces a fuel tax and strict rules on factory emissions to protect people's health. Which value system does this policy best reflect?
Question 31 mark
Which factor is density-dependent?
Question 41 mark
Why does a rise in atmospheric carbon dioxide threaten coral reefs and shellfish?
Question 51 mark
Two woodland plots each contain eight tree species. In plot X one species makes up 90 per cent of the trees; in plot Y the species are present in similar numbers. Which statement is correct?
Question 61 mark
Fields beside a river are replaced by roads, roofs and car parks. What is the most likely effect on the river after heavy rain?
Question 71 mark
What does soil structure describe?
Question 81 mark
How do greenhouse gases warm the lower atmosphere?
Question 91 mark
A wetland filters pollutants from the water flowing through it. What kind of value is this?
Question 101 mark
A population grows at 2.5 per cent a year. Taking doubling time as 70 divided by the growth rate in per cent, about how long will it take to double?
Question 111 mark
An environmental value system can be modelled as a system with inputs and outputs. Which is an output?
Question 121 mark
Ecologists mark 60 woodlice and release them. Next day they catch 45, and 15 are marked. The Lincoln index is N = M x C / R. What is the estimated population?
Question 131 mark
A sample contains three species with 6, 3 and 1 individuals. Simpson's reciprocal index is D = N(N - 1) / sum of n(n - 1). What is D?
Question 141 mark
Why are areas of coastal upwelling often rich fishing grounds?
Question 151 mark
Why does temperature rise with height in the stratosphere?