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Sample the field with a quadrat — read a whole population off a handful of squares.
How ecologists estimate a population they can never fully count. Throw quadrats at random across a field, count the plants inside, and turn those samples into population density, frequency and abundance — the CBSE Class 12 quadrat method, with random sampling and sampling error you can see for yourself.
Beyond the open showcase, subscribed schools get the growing library of Ecology & Environment experiments — searchable, tagged by concept and difficulty, and expanding continuously.