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Environment & Sustainable Development · Question 7 of 52

Using the graph shown, by how much does felling exceed regrowth in year 10?

Question 7

MediumOriginal question

Using the graph shown, by how much does felling exceed regrowth in year 10?

A graph of a forest's yearly regrowth and yearly felling, in thousand cubic metres. Regrowth is a flat line at 60. Felling rises in a straight line: 30 in year 0, 40 in year 2, 50 in year 4, 60 in year 6, 70 in year 8 and 80 in year 10. The two meet at point E, in year 6.
Options for question 7

Show the answer and explanation
CorrectNot quiteAnswer B

Correct answer: B

Explanation

  1. Felling 80 − regrowth 60 = 20 thousand cubic metres a year.

Worth noting

80 is the felling itself; the forest shrinks by the gap between felling and regrowth.

Concept
Carrying capacity
Typical time
70 s
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The rule this testsThe environment and its functions
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