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Environmental Biology

Choose the correct option and encircle it.

1: Energy Earth receives from Sun is known as
a. ionize radiation
b. ozone radiation
c. lunar radiation
d. solar radiation
2: Most abundant constituent of dry air in terms of volume is
a. carbon dioxide
b. helium
c. nitrogen
d. oxygen
3: Percentage of nitrogen in atmosphere of Earth is
a. 91.08%
b. 85.08%
c. 78.08%
d. 65.08%
4: In upper atmosphere, presence of chlorofluorocarbons causes depletion of
a. thermosphere
b. ozone layer
c. exosphere
d. mesosphere
5: Organic compound chlorofluorocarbon contains volatile derivative of ethane, methane and propane which are
a. chlorine
b. fluorine
c. carbon
d. all of above
6: Second highest layer of Earth’s atmosphere is
a. stratosphere
b. mesosphere
c. troposphere
d. thermosphere
7: Introduction of chemicals into atmosphere is known as
a. air pollution
b. radioactive pollution
c. atmospheric pollution
d. dense pollution
8: Chlorofluorocarbons are primarily used as
a. refrigerants
b. fuels of crafts
c. repairers of ozone layer
d. repairers of troposphere
9: Ozone layer is part of layer of
a. mesosphere
b. stratosphere
c. thermosphere
d. troposphere
10: Percentage of oxygen in atmosphere of Earth is
a. 42.94%
b. 35.94%
c. 25.94%
d. 20.94%
11: Second most abundant constituent of dry air in terms of volume after nitrogen is
a. nitrogen
b. oxygen
c. carbon dioxide
d. helium
12: If light does not react with atmosphere then it is classified as
a. direct radiation
b. indirect radiation
c. ionize radiation
d. ozone radiation
13: Lowest layer of Earth’s atmosphere is known as
a. troposphere
b. stratosphere
c. mesosphere
d. ionosphere
14: Chlorofluorocarbons are replacing with less harmful compounds such as
a. hydrocarbons
b. hydrofluorocarbons
c. dichlorodifluoromethane
d. both a and b
15: Which of the following is not a marine pollutant?
a. Oil
b. Plastics
c. Dissolved oxygen
d. All of the above
16: Which of the following is a biodegradable organic chemical/substance?
a. Plastics
b. Oils
c. Pesticides
d. Garbage
17: Which of the following is a major source of thermal pollution in water bodies?
a. Sewage treatment plant
b. Solid waste disposal sites
c. Thermal power plant
d. All of the above
18: Water covers the earth’s surface
a. 40%
b. 65%
c. 70%
d. 90%
19: Gas molecules that absorb thermal infrared radiation and are present in large quantity to change climate system are known as
a. alpha radiations
b. beta radiations
c. ozone gases
d. greenhouse gases
20: Poisoned sea food eating cause disease in people
a. Fever
b. Flue
c. Hepatitis
d. Eye infection

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