226. By 2100 AD, global temperature is expected to rise by about 2^°C and consequently, the sea level by about 50 cm from the present level. How is a rise in temperature expected to increase the level of the sea ?

1. 1. By expanding ocean water

   
   
   

   2. By melting mountain glaciers

   
   
   

   3. By causing ice sheets of Antarctica and Greenland to melt and slide into the oceans

   
   
   

   4. All of the above

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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227. The formation of ozone hole in the Antarctic region has been a cause of concern What could be the reason for the formation of this hole ?

1. 1. Presence of prominent tropo-spheric turbulence; and inflow of chlorofluorocarbons

   
   
   

   2. Presence of prominent polar front and stratospheric: Clouds; and inflow or chorofluorocarbons

   
   
   

   3. Absence of polar front and stratospheric clouds: and inflow of methane and chlorofluorocarbons

   
   
   

   4. Increased temperature at polar region due to global warming

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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228. Forests ecosystems that have suffered a tremendens destruction of habit comprise

1. 1. Temperate forests

   
   
   

   2. Tropical rain forests

   
   
   

   3. Tropical deciduous forests

   
   
   

   4. None of these

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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229. Which is of the following does not fit into a preservation ehtic attitude towards the environment ?

1. 1. Nature has intrinsic value

   
   
   

   2. Continual change and human progress is good in itself

   
   
   

   3. A reverence for life and respect for the rights of all creatures

   
   
   

   4. Human species depends on, and learn from nature

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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230. The rate of growth of a natural population

1. 1. Always reaches the carrying capacity of the ecosystem

   
   
   

   2. Is limited by the carrying capacity of the ecosystem

   
   
   

   3. When graphed, always has a positive slope

   
   
   

   4. Is calculated by subtracting death rate from birth rate

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: B

   NA

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