Skip to content

Course home

Sign up

6.1 Monitoring and maintaining the environment

EasyMediumHard
1234567891011121314151617181920212223242526272829303132333435363738
Question 30
H

A student uses capture-recapture to estimate the size of a population of snails.

Some of the paint marks wear off the snails before the second sample is collected.

What effect does this have on the estimate of the population size?

[1]
A

Snails without marks are more likely to be caught again, so the estimate is too low.

B

Fewer snails are counted as marked in the second sample, so the estimate is too low.

C

More snails in total are caught in the second sample, so the estimate is too high.

D

Fewer snails are counted as marked in the second sample, so the estimate is too high.

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.

Question bank