(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.
(a) Growth models
(1) Exponential growth - When the resources in the habitat are unlimited, each species has the ability to realise its innate potential t grow in number fully.
(2) Logistic growth - In nature, a given habitat has enough resources to support maximum possible number, beyond which no further growth is possible.
(b)
| Exponential growth | Logistic Growth |
| The graph is J-shaped. | The graph is Simoid shaped |
(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) 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.
'Analysis of age-pyramids for human population can provide important inputs for long-term planning strategies.' Explain.
(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.
