31.

Which one of the following statements about the polar jet stream is not true ?

• It moves northwards during summer

• It supplies energy to the circulation of surface storms

• Its location roughly coincides with that of the polar front.

• Its velocity is greater during summer.

Th eprcentage of water vapour in the air in the tropical regions may be as high as

• 4%

• 10%

• 30%

• 50%

The vertical air flow in an anticyclone results in

• diversion aloft

• conversion aloft

• diversion both aloft and at the surface

• convergence at the surface and divergence aloft

The most common salt in the ocean is

• Calcium chloride

• Sodium nitrate

• Sodium chloride

• Calcium nitrate

In the hydrological cycle evaporation is preceded by

• Clouds

• Precipitation

• Heat

• Condensation

Which of the following occupies Trophic Level I in food chain ?

• Bacteria

• Cranivorous

• Primary consumers

• Plants

Which of the following regions is known as the 'carbon sink' of the region ?

• Antarctica

• Savanna

• N.W. Europe

• Tropical rainforest

Ecological Niche

• Interaction between man and environment

• The functional role of an organism in the ecosystem

• Interdependence of man and plant

• None of the above

Who among the following explained the concept that 'the present is the key to the past' ?

• Buffon

• Lyell

• Hutton

• Playfair

The approach that some of the geographical facts according to Ritter , cannot be explained scientifically is termed as 

• Ecological

• Regional

• Teleological

• Locational