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Organisms And Populations

Question
CBSEENBI12001131
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What is competition ? Explain competitive release and Gause’s competitive exclusion principle. Write contribution of Mac Arthur.

Solution
 Competition is an interaction between organisms of the same species (intra-specific) or different species (inter-specific) for the same resources (nutrition, shelter, sunlight, etc.). It harms both the species.

Gause’s competitive exclusion principle states that two closely related species competing for the same resources cannot exist together indefinitely as the competitively inferior one will be eliminated eventually.

Mac Arthur had shown that five closely related species of warblers living on the same tree were able to avoid competition and co-exist to behavioural differences in their foraging activities. He gave an example of 'competitive release'.

Some More Questions From Organisms and Populations Chapter

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 :

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.

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