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Q. Total number of individuals of a species per unit area and per unit time is called

Organisms and Populations

Solution:

Population density is the number of individuals present per unit area or volume at a given time. If the total number of individuals is represented by letter N and the number of units of space (area for land organisms and volume for water organisms) by letter S, then the population density D can be represented as D=N/S. For instance, number of animals per square kilometre, number of trees per acre in a forest, etc.