NEET Biology - Biotechnology & Ecology Environmental Issues Questions Solved


Photochemical smog does not contain :

(1) Ozone

(2) NOx

(3) PAN

(4) Carbon monoxide

(4) Nitric oxide (NO) and nitrogen dioxide (NO2) are emitted from the combustion of fossil fuels, along with being naturally emitted from things such as volcanos and fores  fires (it is the immense concentration of these pollutants within cities that is of the most concern however, as natural emissions tend to spread out over larger areas). When exposed to ultraviolet radiation, NO2 goes through a complex series of reactions with hydrocarbons to produce the components of photochemical smog -- a mixture of ozone, nitric acid, aldehydes, peroxyacyl nitrates (PANs) and other secondary pollutants.

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Identify the incorrectly matched pair with respect to contamination of water
1. Minamata disease: Mercury
2. Blue baby syndrome: excessive nitrates
3. Black foot disease: excessive arsenic
4. Dental caries: excessive fluoride

(4) Dental caries is caused by deficiency of fluride, Excess causes skeletal fluorosis.

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Which award given to individuals or communities from rural areas that have shown extraordinary courage and dedication in protecting wildlife?
1. Venu Menon Animal Allies Award
2. Amrita Devi Bishnoi Award
3. David Shepherd Wildlife Award
4. The Pledge Award

(2) Read page 285, XII NCERT

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Slash and burn agriculture leads to nutrient depleted soils and deforestation if:-

1. crash crops are implanted rather than cereals

2. it is practiced in a sufficiently larger area

3. some useful trees are retained by the farmers

4. sufficient time is not allowed to the land to recover

Read page 284 of XII NCERT

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The Montreal Protocol was signed in 1987 to:

1. prevent deforestation around the world
2. control the emission of ozone depleting substances
3. control the green house gases
4. prevent hazards from radioactive nuclear wastes

(2) Read page 283, XII NCERT

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UV rays are highly injurious to living organisms as:

1. they are a part of invisible electromagnetic spectrum
2. they cannot be stopped by atmospheric gases
3. they are preferentially absorbed by DNA and proteins
4. they cause dissociation of atmospheric oxygen

(3) Read page 283, XII NCERT

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CFC have a continuing effect on ozone layer as:-

1. the Cl atoms formed by them only act as catalysts in reactions causing degradation of ozone

2. the Cl atoms formed by them are used up in reactions causing degradation of ozone

3. they are being produced in increasing amounts all over the world

4. they are efficiently absorbed by the atmospheric water vapors

Read page 282, XII NCERT

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The normal greenhouse effect is necessary for survival of life on Earth as it has raised the temperature of Earth’s surface by:-

1. -18° C

2. 15° C

3. 33° C

4. 50° C

Read page 281, XII NCERT

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The correct descending order of the relative contribution of various greenhouse gases to total global warming is:
1. carbon dioxide; methane; nitrous oxide; CFCs
2. carbon dioxide; CFs; methane; nitrous oxide
3. carbon dioxide; CFs; nitrous oxide; methane
4. carbon dioxide; methane; CFSs; nitrous oxide

Read page 281, Xll NCERT

 

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The Three Mile island is famous as:
1. it hosted the Kyoto protocol
2. it was the site of a large oil spil
3. it was a site of nuclear accident
4. it hosted the Earth summit

(3) Read page 280, XII NCERT

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