Mark and Recapture

Ten 1m² quadrats were placed in a 40m² field. On average 2 snails were found in every quadrat. Estimate the population size of the whole field.

• 2

• 10

• 40

• 80

• 20

Tags

NGSS.MS-LS2-1

Mr Richards wants to estimate population size for crabs on Destin Beach. She uses 2 quadrats and counts 11 crabs in the first and 7 crabs in the second. The quadrats are 2ft². The area of the beach is 20ft². What is the estimated population size of crabs?

• 360

• 90

• 18

• 9

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

When a population needs to be estimated scientists:

• count every individual

• randomly guess the population

• sample the population and use math to estimate

When scientists wish to sample plant populations they use:

• Quadrat Random Sampling

• Transects

• Mark and Recapture

When scientists wish to sample animal populations they use:

• Quadrat Random Sampling

• Transects

• Mark and Recapture

True or False: Probability is involved in population sampling, like the probability of catching a tagged fish.

• True

• False

The population of plants can be estimated by:

• Mark and Recapture

• Quadrat Random Sampling

• Transects

The population of FAST MOVING animals can be estimated by:

• Mark and Recapture

• Quadrat Random Sampling

• Transects

What method do scientists use to calculate population size in the given problem?

• Survey method

• Mark-recapture method

• Census method

• Sampling method

In the formula provided, what does 'R' represent?

• Total population size

• Initially marked individuals

• Marked recaptured individuals

• Total individuals in second sample