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Write short notes on any three of the fo...

Write short notes on any three of the following each with two or three important points :
(f) Population density

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Popular density This refers to the size of population to a unit space at a particular time.
The density of population can be expressed in the following manner
(a) Crude density This is the density of a species population with reference to the total area. It varies according to the season, weather, food supply rate of reproduction, etc.
(b) Ecological density This is the density of a species with reference to the actual area of habitat which is available to the species.
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