Feeding Relationships
1. This question has 3 part(s).
1.1. The plants in a woodland are eaten by mice and caterpillars.
The mice also eat the caterpillars.
The mice are eaten by birds called owls.
Draw a food web showing these feeding relationships.
1.2. Give the term that describes the trophic level of a caterpillar.
1.3. The woodland covered a total area of 5 km2.
A scientist investigates the number of mice and owls in the woodland.
He counts the number of mice and owls on the same summer day each year for five years.
The table shows the scientist’s results.
Year | Number of mice per km2 | Number of owls in the entire woodland |
|---|---|---|
1 | 2 × 103 | 10 |
2 | 2 × 103 | 12 |
3 | 3 × 103 | 12 |
4 | 5 × 103 | 16 |
5 | 1 × 103 | 14 |
(i) Calculate the number of mice in the total area of woodland in year 3.
(2)
(ii) Suggest why there were more mice in year 4 than in the other years.
(3)
(iii) Suggest why the number of owls was fairly constant each year.
(2)
(iv) Suggest a method you would use to estimate the number of mice in the woodland.
(3)
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