Mark and Recapture Quadrat Sampling

If 50 crabs were captured and marked and then released and then a few days later 25 were caught and of those 5 were marked. What would the estimate of the population be?

• 500

• 250

• 75

• 200

Conservationists want to find the population of a species of mountain goat. On one day they capture 12 goats, tag them and release. A week later they capture 8 goats, 5 of which are tagged. What would the estimate of the population be?

• 19

• 40

• 72

• 30

Why do scientists use sampling techniques to gather population data?

• their lazy

• it is not possible to count an entire population

• it is possible to count an entire population

• they like to make estimations

If I wanted to know how many blades of grass are inside the track, which sampling method could I use?

• count every blade of grass

• Mark a random number of blades of grass, return two days later and recapture the blades

• Divide the grassy area into 1 inch sections, randomly pick several sections to count, average them together and multiply that by the total square inches.

Tags

NGSS.MS-LS2-1

NGSS.MS-LS2-4

Which of the following accurately describes the difference between mark recapture and quadrat sampling?

• Quadrat sampling is used for mobile populations and mark recapture is used for stationary populations

• Quadrat sampling is used for stationary populations and mark recapture is used for mobile populations

• Quadrat sampling can only be used for small populations

• Mark recapture sampling can only be used for small populations