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Sampling Habitats

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A series of free Science Lessons for 7th Grade and 8th Grade, KS3 and Checkpoint Science in preparation for GCSE and IGCSE Science.

Random sampling with quadrats
Describe how to collect data on where we find living organisms by using random sampling with quadrats.
• Throw quadrat randomly.
• Count number of organisms in the quadrat.
• Repeat a large number of times to make the results valid.



Sampling along a transect
Describe how to collect data on where we find living organisms by sampling along a transect.
• We use this to see how numbers of organisms change as we move across a habitat.
• A transect is a line such as a tape measure or piece .
• We use a quadrat to count the organisms at intervals on the transect.
Sampling techniques
Explain why sampling techniques are useful.
Describe different methods of collecting organisms.
Pooters, Pitfall Traps, Sweep Nets and Pond Nets

How to use quadrats to estimate population size?

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