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प्रश्न
In certain seasons we sweat profusely while in some other season we shiver. Explain.
उत्तर
Our body is very adaptable. It tries to maintain a constant internal environment while the external environmental condition is changing. This adaptability (homeothermy) is very important for our survival. In summers, when the external conditions are too hot, our body sweats in order to cool itself, while in winters, when the external environment is cold, our body shivers to keep us warm.
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संबंधित प्रश्न
Give an example of an organism that enters 'diapause' and why.
During a school trip to 'Rohtang Pass', one of your classmate suddenly developed 'altitude sickness'. But, she recovered after sometime.
(a) Mention one symptom to diagnose the sickness.
(b) What caused the sickness?
(c) How could she recover by herself after sometime?
Distinguish between Hibernation and Aestivation
List the various abiotic environmental factors.
The figure given below is a diagrammatic representation of response of organisms to abiotic factors. What do A, B and C represent respectively.
| S. No. | A | B | C |
| a. | Conformer | Regulator | Partial Regulator |
| b. | Regulator | Partial Regulator | Conformer |
| c. | Partial Regulator | Regulator | Conformer |
| d. | Regulator | Conformer | Partial Regulator |
Some organisms are able to maintain homeostasis by physical means ________.
Assertion (A): A person goes to high altitude and experiences ‘altitude sickness’ with symptoms like breathing difficulty and heart palpitations.
Reason (R): Due to low atmospheric pressure at high altitudes, the body does not get sufficient oxygen.
In the light of the above statements, choose the correct answer from the options given below.
Salt concentration (Salinity) of the sea measured in parts per thousand is ______.
What is diapause and its significance?
Why do all the fresh water organisms have contractile vacuoles whereas majority of marine organisms lack them?
