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Which is a human-made environment?

• Mountain 

• Sea

• Road

• none

Which is not a natural ecosystem?

• Desert 

• Aquarium 

• Forest

• none

Meteorites burn up in which layer of atmosphere on entering from the space?

• Mesosphere

• Troposphere

• Stratosphere

• Thermosphere

Radio waves transmitted from the earth are reflected back by which of the following layer?

• Thermosphere

• Mesosphere

• Stratosphere

• Troposphere

As we go up the layers of the atmosphere, the pressure

• Increases 

• Decreases 

• Remains the same

Which of the following gases protects us from harmful sun rays?

• Carbon dioxide 

• Nitrogen

• Ozone

Taiga means

• dry

• pure or untouched

• moist

• evergreen

Natural vegetation is generally classified into three broad categories as follows except

• Forests

• Grasslands

• Shrubs

• Flora

Citrus fruits such as oranges, figs, olives and grapes are commonly cultivated here

• Tropical deciduous forest

• Temperate evergreen forest

• Mediterranean Region

• Tropical evergreen forest

Mosses and lichens found in

• Temperate grassland

• Tundra vegetation

• Tropical grassland

• Thorny bushes