Question

(a)
Study the flow chart given below and complete the equation that
follows by identifying 1, 2, 3 and 4.
Immigration
Natality
(B)
Population
Density (N)
Mortality
(D)
Emigration
Nt + 1 = N4 + {(1 + 2) - (3 + 4)}
(b)
Mention the different ways by which the population density of
different species can be measured.
​

Answer 1

Answer:

population density=no. of people/land area in sq. miles or sq. km

Answer 2

Population density

Explanation:

(a) 1 is Natality(B); 2 is Immigration(I); 3 is Mortality(D) and 4 is Emigration(E)

• Natality also known as the birth rate is number of births in a population divided by the total population size
• Immigration is defined as the number of people migrating in a given set of population
• Mortality is the death rate which is number of deaths in a population divided by the total population size
• Emigration is defined as the number of people migrating from a given set of population          

(b) Population density is the number of individuals present per unit area

Different ways by which the population density can be measured are:

• Total number: in this type of method total number of organisms in a population is counted
• Relative densities: in this type relative density of population is taken into account
• Biomass cover: in this type percent cover of different types of plants or organisms present in a population is taken into consideration