Biology 5090 · O Level · Effects of humans on ecosystems
Effects of humans on ecosystems — practice question
Costa Rica is a relatively small nation, occupying about $0.03\%$ of the Earth’s surface.
Roughly $5\%$ of the planet’s plant and animal species are present in Costa Rica.
(a)[2]
Describe, using the figures in the table, how the percentage of forest cover changed from 1940 to 2010.
(b)[5]
Explain the possible negative effects of the change in forest cover between 1940 and 1987.
(c)[3]
Suggest reasons for the change in forest cover between 1987 and 2010.
Worked solution & mark scheme
This 10-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Declined from 75 to 21 by 1987” …