ï»¿ The two gases making highest relative contribution to the green house gases are from Biology Environmental Issues Class 12 Nagaland Board

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The two gases making highest relative contribution to the green house gases are

• CO2 and CH4

• CH4 and NO2

• CFCs and N2O

• CO2 and N2O

A.

CO2 and CH4

The greenhouse effect is a naturally occurring phenomenon that is responsible for heating of earth's surface and atmosphere. Clouds and gases reflect about one-fourth of the incoming solar radiation and absorb some of it but almost half of incoming solar radiation falls on earth's surface heating it , while a small proportion is reflected back. Earth's surface reemits heat in the form of infrared radiation but part of this does not escape into space as atmospheric gases (eg CO2, CH4 etc) absorb a major fraction of it. The molecules of these gases radiate heat energy and a major part of which again comes to earth's surface thus heating it up once again CO2 (60%) and CH4 (20%) are commonly known as greenhouse gases because t hey are responsible for the greenhouse effect, that ultimately leads to global warming.

The greenhouse effect is a naturally occurring phenomenon that is responsible for heating of earth's surface and atmosphere. Clouds and gases reflect about one-fourth of the incoming solar radiation and absorb some of it but almost half of incoming solar radiation falls on earth's surface heating it , while a small proportion is reflected back. Earth's surface reemits heat in the form of infrared radiation but part of this does not escape into space as atmospheric gases (eg CO2, CH4 etc) absorb a major fraction of it. The molecules of these gases radiate heat energy and a major part of which again comes to earth's surface thus heating it up once again CO2 (60%) and CH4 (20%) are commonly known as greenhouse gases because t hey are responsible for the greenhouse effect, that ultimately leads to global warming.

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

C.

Biochemical oxygen demand
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