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Class 10 Class 12

About 70% of total global carbon is found in

• grasslands

• agro -ecosystem

• Oceans

• forests

C.

Oceans

The atmosphere is the source of carbon dioxide, which is utilised by plants in photosynthesis reduced to form carbon compounds. The total mass of carbon currently in the atmosphere is about 7 x 1017 g, ie, 700000 million tonnes Oceans regulate the CO2 content in the atmosphere and thus play a very important role. Sea water contains 50 times more CO2 than air, ie, about 70 % of total global carbon is found in oceans. This is in the form of carbonates and bicarbonates.

The atmosphere is the source of carbon dioxide, which is utilised by plants in photosynthesis reduced to form carbon compounds. The total mass of carbon currently in the atmosphere is about 7 x 1017 g, ie, 700000 million tonnes Oceans regulate the CO2 content in the atmosphere and thus play a very important role. Sea water contains 50 times more CO2 than air, ie, about 70 % of total global carbon is found in oceans. This is in the form of carbonates and bicarbonates.

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The meaning of BOD is :
• Bacterial oxygen demand
• Biological optimum density
• Biochemical oxygen demand
• Bioorganisation decay

C.

Biochemical oxygen demand
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In the scrubber in the electrostatic precipitator the gases are passed through :
• filter
• lime
• spray of water
• both 2 and 3

D.

both 2 and 3
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Which of the following pollutants is not produced by exhaust of motor vehicles ?
• CO
• Hydrocarbon
• Fly-ash
• NO

C.

Fly-ash
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What is the term for the inflammation of cornea due to high absorption of UV-B radiation :
• myopia
• snow blindness
• biomagnification
• None of the above

B.

snow blindness
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Ozone depletion will cause :
• Forest fire
• Pneumonia
• Increased incidence of skin cancer
• None of these

C.

Increased incidence of skin cancer
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