Random : This is used where the habitat being sampled is fairly uniform., Example: The Woodland Project or a feild, To remove observer bias in the selection of samples., Where statistical tests are to be used which require randomly collected data., Where a large area needs to be covered quickly., If time is very limited., Systematic Sampling: To show zonation of species along some environmental gradient.e.g. down a sea shore, across a woodland edge., Where there is some kind of continuous variation along a line,, To sample linear habitats, e.g. a roadside verge., Where physical conditions demand it, e.g. sampling a vertical rock face, using a rope to climb it.,

CAX KS5 Biol sampling types system and random

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