Q: Which of the following gas causes pollution

Important air (gaseous) pollutants are CO, SO2,NO (Oxides of nitrogen), etc.

Q: In B.O.D. test, oxygen plays an important role to

BOD means number of milligrams of O2 required for decomposition of one litre of waste or waste by decomposing microorganisms (bacteria).

Q: Which of the following atmospheric pollutants cause general chlorosis i.e. destruction of chlorophyll

SO2 causes bleaching of leaf pigment (Chlorophyll) or causes chlorosis and necrosis of vegetation and destroy all membrane activity and convert chl a to phaeophytin a.

Question 1

Which of the following steps is taken by the Ministry of Environment and forests to protect rivers from water pollution?

Accepted Answer

The ministry of Environment and forests has initiated Ganga Action plan and Yamuna Action Plan to save these major rivers of our country from pollution. Under these plans. It is proposed to build a large number of sewage treatment plants so that only treated water may be discharged in the rivers

Question 2

Global climate is threatened by increase in concentration of

Accepted Answer

Global climate is threatened by increase in concentration of Green house gases, because this will cause the melting of polar ice caps resulting in a rise of nearly 60 feet on the sea level. Coastal regions and low lying areas all over the world will be go under water.

Question 3

Which of the following gas causes pollution

Accepted Answer

Important air (gaseous) pollutants are CO, SO2​,NO (Oxides of nitrogen), etc.

Question 4

B.O.D. test or biological oxygen demand test is made for measuring

Accepted Answer

Strength of sewage or degree of water pollution is measured in terms of BOD (Biochemical oxygen demand) value.

Question 5

In B.O.D. test, oxygen plays an important role to

Accepted Answer

BOD means number of milligrams of O2​ required for decomposition of one litre of waste or waste by decomposing microorganisms (bacteria).

Question 6

Water pollution can be stopped best by

Accepted Answer

For control of water pollution, sewage oxidation ponds or filter beds or septic tanks or decomposition ponds have been developed. These oxidation ponds have luxuriant growth of algae and bacteria. Algae release O2​ and anaerobic bacteria break down sewage using this O2​.

Question 7

Which of the following atmospheric pollutants cause general chlorosis i.e. destruction of chlorophyll

Accepted Answer

SO2​ causes bleaching of leaf pigment (Chlorophyll) or causes chlorosis and necrosis of vegetation and destroy all membrane activity and convert chl a to phaeophytin a.

Question 8

The major cause (80%) of air pollution in big cities is due to

Accepted Answer

Automobiles are the greatest pollutor of the atmosphere and are responsible for 80% of air pollution of big cities.

Question 9

Pollutant from motor-car exhaust which causes a mental disease is

Accepted Answer

Lead (Pb) is released by combustion of petrol as tetra ethyl lead is used as antiknock in petrol. This lead is very harmful and causes plumbism or lead poisoning, which disturbs nervous system, liver, kidney's in adults and also causes brain damage in children.

Question 10

Photochemical transformation of the automobile exhaust emission in UV wavelength of sunlight results into

Accepted Answer

In the presence of sunlight the hydrocarbons and oxides of N2​ react to form O3​ and PAN (Peroxy acetyl nitrate) and aldehyde and other organic substance.

Question 11

3, 4-benzopyrene causes

Accepted Answer

3,4 benzopyrene released mainly in idling of automobiles causes lung cancer.

Question 12

Which of the following intensity of sound becomes a pollutant

Accepted Answer

Generally sound above 80 dB is termed as noise.

Question 13

It is said, the Tajmahal may be destroyed due to

Accepted Answer

Yellowing and blackening of Taj Mahal at Agra is due to SO2​ and other pollutants released by Mathura refinery.

Question 14

Which of the following is a water polluting factor

Accepted Answer

Water pollution is mainly caused by industrial wastes, sewage, insecticide, herbicides, etc.

Question 15

Which of the following is normally not an atmospheric pollutant

Accepted Answer

Because carbon dioxide is necessary for photosynthesis in plants and non-harmful for human beings. Hence, is not considered as an atmospheric pollutant.

Question 16

Carbon monoxide (CO) is harmful to man because

Accepted Answer

CO is highly toxic and impairs respiration. CO combine with haemoglobin of blood and reduces its O2​ carry capacity.

Question 17

DDT is a

Accepted Answer

DDT is a non-biodegradable pollutant. These are persistent pollutants and are not decomposed naturally or by activity of micro organisms and thus are not recycled back into the atmosphere.

Question 18

Some effects of sulphur dioxide and its transformation products on plants include

Accepted Answer

Plants are more sensitive to SO2​ than animals and man. In most plants chlorophyll pigment destroyed under intense exposure to SO2​ due to conversion of chlorophyll a to phaeophytin a.

Question 19

In a polluted lake, the index of pollution is

Accepted Answer

Some organism like Daphnia, Trout and fishes are sensitive to water pollution and they are indicators of water pollution.

Question 20

BOD stands for

Accepted Answer

BOD, also called biochemical oxygen demand, is another very common index of the quality of water based on quantification of the overall concentration of organic substances by their effect on the respiration of a microbial biomass.

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Solutions for Biology-for-NEET-Volume-2-Class-XII by Career Point, Environmental Issues

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