(a) Represent diagrammatically three kinds of age-pyramids for the human population.
(b) How does an age pyramid for human population at given point of time helps the policy makers in planning for the future.
(a) A population can be composed of individuals of different age groups. Age distribution plot for a given population is given by the age pyramid.
(b) The structure of the age pyramid determines the growth status of the population, that is, whether it is growing, stable or declining. On the basis of the collective information, the policies for the population can be decided. These may emphasis on providing food to the population, development of proper health services and much more.
For example, if the population is growing the policies can be made to increase the food resources to maintain the population.
If the population is declining then the policies can be made to keep a check on the mortality rate of the population.
(a) List the different attributes that a population has and not an individual organism.
(b) What is population density ? Explain any three different ways the population density can be measured, with the help of an example each.
'Analysis of age-pyramids for human population can provide important inputs for long-term planning strategies.' Explain.
(a) Explain giving reasons why the tourists visiting Rohtang Pass or Mansarovar are advised to resume normal active life only after a few days of reaching there.
(b) It is impossible to find small animals in the polar regions. Give reasons.
(a) Name the two growth models that represent populations growth and draw the respective growth curves they represent.
(b) State the basis for the difference in the shape of these curves.
(c) Which one of the curves represent the human population growth at present ? Do you think such a curve is sustainable ? Give reason in support of your answer.
