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A-LevelBiologyBiodiversity and conservation9700/43 · May/June 2019 · Q76 Marks

The passage below outlines one method used by a student to estimate the population size of an animal species. Complete the passage by using the most appropriate scientific term or terms. A student estimated the population size of an animal species using the mark-release- technique. This can only be used for animals such as mice. The student caught a sample of mice using humane traps. The student then marked the mice in a way that did not them. For example, the mark did not make them more visible to potential . The student released the marked mice and left enough time for them to randomly with the population. The student then caught a second sample of mice and noted the numbers of marked and unmarked mice. The student estimated the population size by multiplying the number of mice in the first sample by the number in the second sample, then dividing by the number of mice in the second sample.

  1. 7The passage below outlines one method used by a student to estimate the population size of an animal species. Complete the passage by using the most appropriate scientific term or terms. A student estimated the population size of an animal species using the mark-release- technique. This can only be used for animals such as mice. The student caught a sample of mice using humane traps. The student then marked the mice in a way that did not them. For example, the mark did not make them more visible to potential . The student released the marked mice and left enough time for them to randomly with the population. The student then caught a second sample of mice and noted the numbers of marked and unmarked mice. The student estimated the population size by multiplying the number of mice in the first sample by the number in the second sample, then dividing by the number of mice in the second sample.[6]

Mark scheme

Marking points from the official mark scheme (May/June 2019). The mark or mark type is shown in brackets.

  1. [6] (7) recapture; small / mobile / AW ; harm; predators; mix / disperse / integrate; marked;

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About this question

Topic
Biodiversity and conservation, A-Level Biology (syllabus 9700). Structured question, 6 marks.
Source
A-Level Biology, May/June 2019 Paper 4 Variant 3, question 7.

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