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Organisms And Populations

Question
CBSEENBI12001996

How do organisms cope with stressful external environmental conditions which are localised or of short duration?

Solution

The organisms cope up with the localised or short duration stressful conditions in the following ways:
Plants undergo dormancy and germinate on the availability of suitable conditions. The seeds and some other vegetative structures serve as means to tide over the period of harsh conditions and germinate under the favourable condition when the temperature and moisture are adequate.
Animals either migrate to some other place where the environmental conditions are favourable, or they go into aestivation or hibernation. The zooplankton enters into the state of diapause. All these stages show minimal metabolic activity and suspended development. 

Some More Questions From Organisms and Populations Chapter

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........................ 

The parasites that feed on external surface of host organisms are called ........................