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Organisms And Populations

Question
CBSEENBI12001072
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Define mutualism. Give examples.

Solution
Mutualism. It is a symbiotic relationship between the members of two species in which the two partners are mutually benefited. There is a complete dependence of the partners on each other, and one cannot survive in the absence of the other. Sometimes the term symbiosis is used as synonym with mutualism.

Examples. 1. Mutualism between Rhizobium and leguminous plants. The rhizobium bacteria helps the plant to fix nitrogen whereas the plant provides food and shelter to the bacteria.

2.Mutualism between plants and fungus. Lichens involve the symbiotic association of a green alga and a fungus. The fungus provides protection to algae whereas the algae provides food to the fungus

 

Some More Questions From Organisms and Populations Chapter

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.

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

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