CTET Solved Paper - UTET April 2015
36. The lowest layer of atmosphere is known as
- Option : A
- Explanation : Troposphere is the lowest layer of atmosphere. It is full of oxygen and nitrogen that allows the organisms to survive.
37. Acid rain is caused due to increase in concentraction of
- Option : A
- Explanation : Acid rain is very common in large cities with huge industries and carbon emission from their machines. SO2 and CO2 gets combined with water and causes a chemical reaction and falls in Earth as Acid rain.
- Option : D
- Explanation : All endangered, vulnerable and threatened species are entered into the 'Red Data Book' of the United Nations for listing the animals of the world.
- Option : B
- Explanation : When the grasses in mountains or slopes are over grazed, it weakens the growth of buds and roots. It results in the loosening of grips holding soils by the roots. This makes the upper layer of soils easier for soil erosion through rains.
40. When we move from pole to equator, then biodiversity
- Option : A
- Explanation : Pole has lesser biodiversity due to the extreme cold weather as compared to equator, the living organisms can survive in equator for more time and can multiply in good environment.
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