There is a surprising amount of biodiversity in the school grounds - even on the playing fields which look dominated by grass.
This activity can be used to develop an understanding of plant biodiversity and introduce the core fieldwork technique of random sampling with quadrats. Random sampling allows you to make an estimate of the populations of different species in any area, and eliminates sampling bias which can be introduced by the sampler selecting areas that look interesting or easier to count.
The Field Studies Council key Playing field plants is useful for identifying the species which typically would be found on a school playing field.
There is scope for students to develop and investigate hypotheses about plant distribution based on observations and measurements of factors such as soil, moisture, light intensity and wind speed. Observations of human or other animal activity in the area, and background information about the characteristics of common playing field plants, provide further starting points for developing hypotheses to test over short or long time scales.