English National Curriculum - Science

Measuring biodiversity - using a quadrat

Mission Objectives

Describe the steps involved in using quadrats for random sampling

Calculate the mean number of organisms from multiple quadrat samples to estimate plant abundance

Explain the purpose of sampling in ecological studies, particularly why ecologists estimate the number of organisms rather than counting all individuals

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Keywords

Words and meanings to learn

abundance

the quantity or amount of something present in a particular area, volume or sample

quadrat

a portable frame used to mark out a small area of habitat, typically of one square metre

bias

showing inclination or prejudice for or against something

distribution

how something is spread over an area

yield

the total number of organisms counted per area sampled and total biomass or productivity

This lesson has been written by

Samantha Batch

Samantha is an accomplished science educator with over 15 years of leadership experience and a strong background in scientific analysis. She has a proven record of leading departments effectively, improving practice, and working collaboratively with stakeholders.

In her current work, Samantha embeds evidence-informed pedagogical principles such as retrieval practice, clear modelling, and effective sequencing to support high-quality curriculum design and professional development. She draws on assessment insight and common misconceptions to help teachers secure strong student understanding.

She is a former Head of Chemistry and Sixth Form Tutor at Ilkley Grammar School, with extensive Key Stage 4 and 5 experience, and an AQA examiner, giving her valuable insight into assessment standards and exam requirements.

In her spare time, Samantha enjoys playing the accordion with her local orchestra and has recently taken up cricket. 

Required Resources

  • Quadrat
  • Clip boards 
  • Paper 
  • Number generator
  • Handouts

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