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Organisms And Populations

Question
CBSEENBI12001968
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(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.

Solution

(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. 

Some More Questions From Organisms and Populations Chapter

Fill in the blanks with suitable words :

1. The optimal capacity of the organism to produce offspring is called........................

2. Rapid increase in human population is called........................

3. Mathematical expression of the growth of population is called........................

4. Yeast cells grown in a culture medium show........................growth curve.

5. Main cause of population explosion is........................

State true or false :

Coin one word for the following statements :

1.Organism that can tolerate only a narrow range of salinity.

2. Plants that can survive a wide range of temperature.

3. Interaction of two species in which one is benefited while other is neither benefited nor harmed.

4. Number of births during a given period in the population that are added to the initial density.

5. the process of maintaing a constant body temperature.

A few organisms can tolerate and thrive in a wide range of temperature, they are called........................

Majority of organisms are restricted to a narrow range of temperature, such organisms are called ........................ 

The organisms ideally try to maintain the constancy of its internal environment by the process called........................

Mammals from colder climates have shorter ears and limbs to minimize heat loss. This rule is called........................ 

The parasites that feed on external surface of host organisms are called ........................

The parasites that live inside the body at different sites (liver, kidney, lungs, RBC etc.) are called........................

List two negative interactions between two species.

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