Related Topics:

GCSE/IGCSE Biology

Biology Required Practicals

GCSE/IGCSE Physics

GCSE/IGCSE Chemistry

GCSE/IGCSE Maths

Investigate the relationship between organisms and their environment using field-work techniques, including quadrats and belt transects.

- This investigation involves the use of a belt transect along a gradient (e.g. shaded area to an area with no shade).
- It involves students thinking about how to sample their chosen area, including the identification and observation of plants/organisms.

**Sampling with Quadrats**

How to estimate population size using random sampling with a quadrat?

Observe changes in population along a transect.

00:00 Estimating population - random sampling

01:10 Counting organisms

02:07 Calculating population

02:40 Using a transect

03:50 Analysis - biotic & abiotic factors

**Required Practical: Sampling Organisms**

- Sampling organisms by using random sampling.
- Sampling along a quadrat.

Check out the sample question and solution on Sample Assessment Material (page 48), paper 1BI0/1BH and 1BIO/1BF.

A scientist wanted to estimate the number of earthworms in a field using a quadrat.

The scientist places the quadrats at random on the surface of the area being sampled and then watered the area with a very dilute solution of mustard.

This causes the earthworms to come to the surface to be counted.

Give a reason why the quadrats were placed at random.

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