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9.1 Ecosystems and interdependence

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Question 18
F

Students count 24 snails in twelve quadrats, each with an area of 0.5 m2.

What is the mean snail population density?

[1]
A

1 snail per m21\text{ snail per }\mathrm{m}^21 snail per m2

B

2 snails per m22\text{ snails per }\mathrm{m}^22 snails per m2

C

12 snails per m212\text{ snails per }\mathrm{m}^212 snails per m2

D

4 snails per m24\text{ snails per }\mathrm{m}^24 snails per m2

Markscheme

9.1 Ecosystems and interdependence Questions

  1. GCSE
  2. /Biology
  3. /9.1 Ecosystems and interdependence

39 exam-style questions on Edexcel GCSE Biology 9.1 Ecosystems and interdependence, covering 9.1.1 Levels of organisation in ecosystems, 9.1.2 Abiotic and biotic factors, 9.1.3 Importance of interdependence, 9.1.4 Parasitism and mutualism, and 9.1.5 Determining number of organisms in an area. Each one has a worked solution and a mark scheme showing where the marks go.

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