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7.1 Adaptations, interdependence and competition

7.1 Adaptations, interdependence and competition

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Question 5

Students investigated the size of the population of copepods in a pond.

They used the following method:

  1. Collect 1 dm3 of pond water.
  2. Filter the water and count the number of copepods.
  3. Repeat to obtain five samples in total.

Table of Results

Sample numberNumber of copepods in 1 dm3 of water
114
232
30
418
526
a.

Calculate the mean number of copepods in 1 m3 of pond water. (Note: 1 m3=1000 dm31\text{ m}^3 = 1000\text{ dm}^31 m3=1000 dm3)

[2]
b.

The pond is rectangular with the following measurements:

  • length=3.2 m\text{length} = 3.2\text{ m}length=3.2 m
  • width=2.5 m\text{width} = 2.5\text{ m}width=2.5 m
  • depth=0.5 m\text{depth} = 0.5\text{ m}depth=0.5 m

Calculate the estimated total number of copepods in the pond. Give your answer in standard form.

[3]
Markscheme

7.1 Adaptations, interdependence and competition Questions

  1. GCSE
  2. /Biology
  3. /7.1 Adaptations, interdependence and competition

63 exam-style questions on AQA GCSE Biology 7.1 Adaptations, interdependence and competition, covering 7.1.1 Communities, 7.1.2 Abiotic factors, 7.1.3 Biotic factors, and 7.1.4 Adaptations. Each one has a worked solution and a mark scheme showing where the marks go.

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