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Organisms And Populations

Question
CBSEENBI12047364
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A biologist studied the population of rats in a barn. He found that the average natality was 250, average mortality 240, immigration 20 and emigration 30. The net increase in population is

  • 10

  • 15

  • 05

  • Zero

Solution

D.

Zero

A population has birth rates and death rates. The rates are expressed as change in numbers (increase or decrease) with respect to members of the population.

In this case, the net increase in populations in population will be:

Birth Rate (B) + Immigration (I) - Death Rate (D) + Emmigration (E).

Some More Questions From Organisms and Populations Chapter

The departure of a individual from a population is called :

In which interaction only one species is benefitted while the other species is neither harmed nor benefitted ?

Which of the following interaction both species suffer ?

In which of the following interaction both species are benefitted ?

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........................

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