RPAScience GCSE Quadrats

Unbiased sampling is:

• when you choose the group you think will represent the sample
• when any member of the population is equally likely to be chosen for the sample

Biased sampling is

• when you choose a population that is more likely to give you the result you want
• when you choose a group that is equally likely to be chosen

Tags

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What is a suitable way to sample plants in a field?

• Counting Random Plants

• Using Quadrates

• Using Pooters

• Using Pitfall traps

What is a quadrate

• A type of bike

• A sampling tool typically of one square metre, used to sample plants

• A sampling tool typically of one square metre, used to sample animals

• A type of hat

Which of the following is true about quadrates?

• quadrats should be placed randomly so that a representative sample is taken

• you should look at the results from several quadrats in an area to reduce the effect of an unusual distribution

• the results are more reliable when you look at the results from many quadrats

• All the above are true

When sampling daisies how will amount of light affect them?

• Less Light = More Daisies

• More Light = Less Daisies

• More Light = More Daisies

• Less Light = More Grass

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What is the best way to place a quadrate?

• Place it where you like

• Divide the sample area into a grid and use a random number generator to choose a square.

• Throw the quadrate so it's random

• Divide the sample area into a grid and choose a square.

These four 1m² squared quadrats were place in a 8m² garden. Estimate the total population of flowers in the whole garden.

• 16

• 17

• 8

• 40

• 20

Tags

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This 1m² squared quadrat was place in a 3m² beach. Estimate the total population of crabs in the whole beach.

• 15

• 12

• 18

• 6

• 5

Tags

NGSS.MS-LS2-1

Why do scientists use sampling techniques to gather population data rather than counting everything?

• scientists are lazy

• sampling is more efficient and achievable

• sampling is more accurate

• scientists prefer estimations

• sampling is cheaper

Tags

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