7.1 Adaptations, interdependence and competition

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Question 1
Medium

Students investigated the population of Copepods in a rectangular pond.

They collected five sample volumes of 1 dm31\text{ dm}^31 dm3 each from different locations in the pond, filtered out the Copepods, and counted them. The results are shown in Table 1 below:

Sample numberNumber of Copepods in 1 dm31\text{ dm}^31 dm3 of water
114
222
33
418
523
a.

Calculate the mean number of Copepods in 1 m31\text{ m}^31 m3 of pond water, given that 1 m3=1000 dm31\text{ m}^3 = 1000\text{ dm}^31 m3=1000 dm3.

[2]
b.

The pond has a rectangular volume with the following measurements:

  • length=3.5 m\text{length} = 3.5\text{ m}length=3.5 m
  • width=2.0 m\text{width} = 2.0\text{ m}width=2.0 m
  • depth=0.5 m\text{depth} = 0.5\text{ m}depth=0.5 m

Calculate the estimated total number of Copepods in the entire pond. Give your final answer in standard form.

[3]

7.1 Adaptations, interdependence and competition Questions

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