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Organisms And Populations

Question
CBSEENBI12003353
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A small rise in the body temperature of humans is corrected by

(i) sweating
(ii) dilating the skin arteries
(iii) constricting the skin arteries
(iv) increased tension of muscles in the skin

  • (i) only

  • (ii) only

  • (i) and (ii)

  • (iii) and (iv)

Solution

C.

(i) and (ii)

A small rise in body temperature is detected by sensory receptors in the skin and by special neurons, which monitor blood temperature, in the hypothalamus itself. When the neural centre of the hypothalamus involved in lowering body temperature receives information that body temperature is too high, it commands the arteries of the skin to dilate so that more blood, and therefore more heat, reaches the surface where heat can be lost. A large rise in body temperature causes the hypothalamus to command both an extreme dilation in the arteries of the skin and the release of sweat from the body

Some More Questions From Organisms and Populations Chapter

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

Majority of organisms are restricted to a narrow range of temperature, such organisms are called ........................ 

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