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6.1 Monitoring and maintaining the environment

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Question 28
F

A student estimates the number of snails in a garden.

The student catches 40 snails, marks them and releases them.

A day later the student catches 50 snails. 10 of these snails are marked.

The student uses this equation:

estimated population size=number marked in first sample×number caught in second samplenumber of marked animals in second sample \text{estimated population size} = \frac{\text{number marked in first sample} \times \text{number caught in second sample}}{\text{number of marked animals in second sample}} estimated population size=number of marked animals in second samplenumber marked in first sample×number caught in second sample​

What is the estimated number of snails in the garden?

[1]
A

808080

B

909090

C

200200200

D

2 0002\,0002000

Markscheme

6.1 Monitoring and maintaining the environment Questions

  1. GCSE
  2. /Biology
  3. /6.1 Monitoring and maintaining the environment

109 exam-style questions on OCR GCSE Biology 6.1 Monitoring and maintaining the environment, covering 6.1.1 Field investigation of distribution and abundance, 6.1.2 Human interactions and biodiversity, 6.1.3 Maintaining biodiversity, and 6.1.4 Environmental change and distribution of organisms. Each one has a worked solution and a mark scheme showing where the marks go.

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