List the attributes that populations but not individuals possess

7/8/2015 CBSE


 



List the attributes that populations but not individuals possess.






Answer :


A population can be defined as a group of individuals of the same species
residing in a particular geographical area at a particular time and functioning
as a unit. For example, all human beings living at a particular place at a
particular time constitute the population of humans.



The main attributes or characteristics of a population residing in a given area
are:-



(a) Birth
rate
 (Natality): It is the ratio
of live births in an area to the population of an area. It is expressed as the
number of individuals added to the population with respect to the members of the
population.



(b) Death
rate
 (Mortality): It is the ratio
of deaths in an area to the population of an area. It is expressed as the loss
of individuals with respect to the members of the population.



(c) Sex
ratio
: It is the number of males or females per thousand individuals.



(d) Age
Distribution
: It is the percentage of individuals of different ages in a
given population. At any given time, the population is composed of individuals
that are present in various age groups. The age distribution pattern is commonly
represented through age pyramids.



(e) Population density:
It is defined as the number of individuals of a population present per unit area
at a given time.




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