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Organisms And Populations

Question
CBSEENBI12001068
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How does age distribution help in study of population?
Or
Give representation of a declining pyramid of age for human population.
Or
Give representation of stable pyramid of age for human population?

Solution

Age distribution (Age composition). The relative abundance of the organisms of various age groups in the population is called age distribution of population.It gives a status of the growth of the population.

 Age structure of hypothetical populations which are expected to increase, remain stable or decline with the passage of time.
(a) Expanding Population - In this the number individual in pre-reproductive stage and reproductive stage are more than the individuals in the post-reproductive stage, so the growth of population is high.
(b) Stable population. It has equal number of individuals in all stages , so population shows no growth.
(c) Declining population. It has higher number of individuals in the post reproductive stages so the  population of young members is lower than that of old members and hence growth is retarded.

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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