Q15 of 42 Page 1

(a) Compare the characteristics of the following :

(i) Eurythermal and Stenothermal organisms


(ii) Euryhaline and Stenohaline organisms


(b) How does our body get acclimatized to ‘altitude sickness’?



a) i)



ii)



c) Altitude sickness is caused by being at high altitude where oxygen level is low


Body can adapt it as the lack of oxygen is sensed by the carotid bodies, which causes increase in breathing depth and rate


There is increase in RBC


More from this chapter

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13

Explain any three remedial measures to overcome the acute air pollution in our cities.

OR


Write any three ways by which noise pollution affects the human bodyadversely. List any three steps that should be followed in order to reduce noise pollution.


 14

(a) What is the primary productivity of an ecosystem and how is itexpressed ?

(b) Explain what does the equation given below show:


NPP = GPP – R


OR


(a) Name the type of detritus that decomposes faster. List any twofactors that enhance the rate of decomposition.


(b) Write the different steps taken in humification and mineralization during the process of decomposition.


 16

Write any two biochemical/molecular diagnostic procedures for early detection of viral infection. Explain the principle of any one of them.

OR


Describe the steps that are followed during secondary treatment of sewage.


 17

How did the plant breeders produce suitable varieties of sugarcane forcultivation in North India? Why did they do it?