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Ecosystems and Biodiversity · Question 13 of 68

Question 13

MediumOriginal question

Plants in a field trap 20,000 J of the Sun's energy. Grasshoppers eat the plants, frogs eat the grasshoppers and snakes eat the frogs. By the 10 per cent law, how much of this energy reaches the snakes?

Options for question 13

Show the answer and explanation
CorrectNot quiteAnswer B

Correct answer: B

Explanation

  1. Only about 10% of the energy at one level passes to the next.

  2. Grasshoppers get 2,000 J, frogs 200 J and snakes 20 J.

Worth noting

200 J is what the frogs get; count one step for each arrow, three arrows from plants to snakes.

Concept
The 10 per cent law
Typical time
60 s
Your time
—
The rule this testsFood chains and energy flow
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