Tag: zoology

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Questions Related to zoology

Multiple choice zoology environmental pollution primary air pollutants air pollution - types and sources not for breathing not for drinking

Which of the following will not cause an environmental pollution?

  1. Noise from vehicles

  2. The Using of chemical fertilizers

  3. Improper disposal of sewage

  4. The Using of a CFC free refrigerator
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The noise from the horn and engines of the vehicles results in sound pollution. The use of extensive chemical fertilizers causes accumulation of these chemicals in the soil and leaching into the ground water. The runoff of these chemicals into water causes water pollution. The improper disposal of sewage results in water pollution. The use of CFC-free refrigerator does not cause any air pollution.

Thus, the correct answer is option D. 

Multiple choice zoology environmental pollution primary air pollutants air pollution - types and sources not for breathing not for drinking

Particulate pollution can be caused by

  1. Smoke

  2. Stone drilling

  3. Dust

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The air pollution is basically of two types:
A. Gaseous pollution: Harmful gases given out from variety of sources. 
B. Particulate pollution: Particles such as those of dust, smoke, mining, stone drilling, wearing of rubber tyres of motor vehicles.

Multiple choice zoology environmental pollution primary air pollutants air pollution - types and sources not for breathing not for drinking

Which of the following are true?

(i) Benzene hexachloride is a non biodegradable pollutant.
(ii) Anthropogenic air pollutants are natural in origin.
(iii) Carbon monoxide is a primary air pollutant.
(iv) Sulphur dioxide causes brown air effect during traffic congestion in cities.

  1. (i) and (iii) only

  2. (i) and (ii) only

  3. (ii) and (iii) only

  4. (ii) and (iv) only

  5. (i) and (iv) only
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

 In traffic-congested city air, nitrogen oxides produce brown air or reddish-brown haze. The pollutant that does not get degraded or broken down into the harmless material is a nondegradable pollutant example Benzene Hexachloride (BHC). Anthropogenic pollution is man-made pollution resulting from human activities like burning fossil fuel, deforestation, mining, sewage etc. A primary air pollutant is a pollutant that persists in the environment in the form it is produced example carbon monoxide.

Multiple choice zoology environmental pollution primary air pollutants air pollution - types and sources not for breathing not for drinking

Secondary pollutant which stops Hill reaction is

  1. Sulphuric acid

  2. Nitric acid

  3. Peroxyacetyl nitrate (PAN)

  4. Aldehydes
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Secondary air pollutants are usually produced photochemically from primary pollutants and are called photochemical oxidants. Secondary air pollutants occur in photochemical smog. Nitrogen oxides, oxygen and ketone bodies combine to form peroxy acyl nitrates or PAN which is a major constituent of photochemical smog. PAN damages chloroplasts, inhibit electron system and spoil enzyme systems controlling cellular metabolism which causes Hill reaction during photosynthesis .

Multiple choice zoology environmental pollution primary air pollutants air pollution - types and sources not for breathing not for drinking

Two components of automobile exhausts, which can interact to produce secondary pollutants are

  1. Carbon monoxide and nitrogen oxides

  2. Nitrogen oxides and hydrocarbons

  3. Carbon dioxide and sulphur dioxide

  4. Sulphur and nitrogen oxides
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The primary pollutants are directly released from the source like hydrocarbons are released when fossil fuels are burnt and nitrogen oxides are released due to vehicular combustion and also fossil fuel burning. When these primary pollutants react with each other they form a more potent secondary pollutant called the ozone, which is a poisonous gas in the troposphere.

Hence, the correct answer is 'Nitrogen oxides and hydrocarbons'

Multiple choice zoology environmental pollution primary air pollutants air pollution - types and sources not for breathing not for drinking

A secondary pollutant is

  1. CO
  2. $CO _2$

  3. PAN

  4. Aerosol
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The photochemical smog has the chief constituent of the peroxy-acetyl nitrate (PAN) that are secondary pollutants as they formed by the primary pollutants. These are formed when the hydrocarbon radicals react with the oxygen in the presence of the sunlight. It forms a brown-coloured haze. This also results in the formation of the ground-level ozone. 

So, the correct answer is 'PAN'

Multiple choice zoology environmental pollution primary air pollutants air pollution - types and sources not for breathing not for drinking

Which one of the following acts as secondary pollutants?

  1. Br
  2. $NO _2$
  3. $HNO _3$
  4. $Cl _2$
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Pollutants may be primary or secondary.
  • Primary pollutants are the pollutants that are directly released or emitted in the atmosphere. 
  • Secondary pollutants are the pollutants which are formed when primary pollutants react with themselves or with other components of atmosphere.
An example of secondary pollutant is NO2 which is formed when NO reacts with oxygen in air.
So, the correct answer is 'NO2'.
Multiple choice zoology environmental pollution primary air pollutants air pollution - types and sources not for breathing not for drinking

Examples of secondary air pollutants is/are

  1. Smog

  2. PAN
  3. $O _3$

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Secondary pollutant is an air pollutant that do not emit directly from the source but forms when primary pollutant reacts in the atmosphere. For example $O _3$ and PAM forms when hydrocarbon reacts with nitrogen oxides in the presence of sunlight, smog forms when industrial or vehicle fumes reacts with sunlight in atmosphere. Thus, the correct answer is 'All of the above'.