Quadrats, are square ____ of wire, often with an area of 0.25 m2. These are placed on the ____ area to estimate the ____ of plants or slow-moving animals within them. You can investigate different factors, including the number of an individual ____, species ____ and ____ cover. Percentage cover rather than number of individuals is used when estimating plant ____ if it is difficult to identify ____ plants, such as grasses, moss or seaweeds on rocks. ____ sampling using a quadrat involves the placing of ____ at random ____. Systematic sampling uses a line called a ____, sampling at ____ intervals along it, often using a quadrat. Transects are used where the habitat is not ____ and may show different ____. Systematic sampling can be used if there is a ____ or pattern across the habitat, such as distance up a ____, or altitude on a hillside.

quadrats

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