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Organisms And Populations

Question
CBSEENBI12001815

What is mutualism? Mention any two examples where the organisms involved are commercially exploited in agriculture.

Solution
Mutualism is the interaction between the organisms of two species in which both organisms are benefited.
Examples of the organisms involved that are commercially exploited in agriculture are as follows:
(i) Rhizobium  which is a mutual relationship between bacteria and leguminous plants is used as a biofertiliser. These enrich the nutrient quality of the soil by fixing atmospheric nitrogen into organic forms..
(ii) Mycorrhiza which is an association of the soil fungus and the roots of higher plants. Farmers use Mycorrhiza commercially in agriculture as it improves the soil quality and plant growth and development, reduces soil erosion, help the plants absorb phosphorous from the soil. Plants having such associations show  resistance to root-borne pathogens, tolerance to salinity and drought.

Some More Questions From Organisms and Populations Chapter

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

Mammals from colder climates have shorter ears and limbs to minimize heat loss. This rule is called........................