| Population density is the population per unit |
| a) | Area | b) | Land area |
| c) | Water area | d) | Desert area |
| (a)Population density (in agriculture standing stock and standing crop) is a measurement of population per unit area or unit volume. It is frequently applied to living organisms and particularly to humans. It is a key geographic term. It is expressed in m/cm/mm per square as appropriate for the population size |