1.1 Sampling and abiotic factors

What is a Belt Transect?

• A way of sampling the effect of an abiotic factor on the distribution of organisms

• A way of sampling a non-changing habitat

• A way of measuring the effect of a biotic factor on the distribution of organisms

Using a grid with coordinates to place quadrats is an example of:

• random sampling

• systematic sampling

Using a transect to place quadrats is an example of:

• systematic sampling

• random sampling

What is the best way to place a quadrat?

• Place it where you like

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

• Throw the quadrat so it's random

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

Random sampling is used to estimate a population of a species in a habitat. Which of these is NOT correct?

• We can just chuck the quadrat where we want to sample

• We must choose coordinates randomly to avoid being biased in our results

• We must take multiple readings and calculate a mean number

• This method only really works for plants and (very)slow moving animals

A student was randomly sampling to estimate a clover population. In 5 quadrats, they found 11, 8, 11, 9 and 1 clover plants. What is the mode for these results?

• 8

• 9

• 11

• 40

Which of the following hypotheses would we use a transect sample for?

• Comparing the population of daisies growing on lawns at the front and back of a house

• Seeing if the height of stinging nettles changes as you move further away from a footpath

• Estimating the total population of strawberry plants in a farmer's field

• Investigating changes in the plant species present in sand dunes as you move further away from a beach

Tags

NGSS.MS-LS2-4

A student was randomly sampling to estimate a clover population. In 5 quadrats, they found 11, 8, 11, 9 and 1 clover plants. What is the mean for these results? Type out the number digits

Why is a random number generator is used to select coordinates for sampling?

• To make the sampling easier

• To avoid bias

• To save some time

• It is cheaper

Identify the line represented by the tape measure in the image