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Q 1.
How marine animals use carbonate dissolved in sea water?
Ans.
Through their shells.
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Q 2.
Which cell needs oxygen to break down into glucose?
Ans.
Eukaryotic cells and Prokaryotic cells.
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Q 3.
Percentage of carbon dioxide present in Venus and Mars?
Ans.
95-97%.
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Q 4.
Name two planets where no life exists?
Ans.
Venus and Mars
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Q 5.
Outer crust of the earth is called?
Ans.
Lithosphere.
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Q 6.
Name the major component of atmosphere found in Venus and Mars?
Ans.
Carbon dioxide.
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Q 7.
Green plants converts carbon dioxide into ___ in the presence of sun light?
Ans.
Glucose.
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Q 8.
How many percent of earth surface covered by water?
Ans.
75%.
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Q 9.
Causes of soil erosion?
Ans.
Deforestation, over grazing by animals and by air.
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Q 10.
We need to conserve our natural resources and use them in a?
Ans.
Sustainable manner.
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Q 11.
Causes of air pollution?
Ans.
1.Unburnt carbon particles
2.Oxides of Sulphur 3.Oxides of Nitrogen. |
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Q 12.
Rainfall depends on?
Ans.
Prevailing wind patterns in an area.
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Q 13.
Evaporation of water from water bodies and subsequent condensation gives us?
Ans.
Rain.
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Q 14.
Uneven heating of air over land and water bodies causes?
Ans.
Winds.
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Q 15.
Life on earth depends upon?
Ans.
Soil, water, air and energy from sun.
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Q 16.
Which monsoon bring rains in large parts of India?
Ans.
South West monsoon and North East monsoon.
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Q 17.
At which place the hole in the ozone layer has been discovered?
Ans.
Above the Antarctica.
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Q 18.
Harmful radiation from sun are absorbed by?
Ans.
Ozone layer.
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Q 19.
Temperature range on the surface of moon?
Ans.
-190°C to 110°C.
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Q 20.
Formula of ozone?
Ans.
O3.
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