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Organisms And Populations

Question
CBSEENBI12003110
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The permanent decrease in population number occurs due to

  • migration

  • natality

  • emigration

  • mortality

Solution

D.

mortality

Mortality is the death rate per thousand individuals. Its rate decreases population size and population density. It is due to improved personal hygiene, sanitation and modern medicines.

∴ Mortality = 100×BirthsDeaths

Some More Questions From Organisms and Populations Chapter

To live in groups is beneficial because :

Ants give information to their companions :

Population density is denoted by the symbol

The number of births during a given period in the
population that are added to the initial density is 

 :

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 :

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