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Environmental Issues · Question 25

NEET 2016 (Phase 2)MCQMedium📈 Topic in 12% papers+4−1
1

Biochemical Oxygen Demand (BOD) may not be a good index for pollution for water bodies receiving effluents from

  1. petroleum industry
  2. sugar industry
  3. domestic sewage
  4. dairy industry

Answer

(1) petroleum industry

Solution

BOD is the amount of oxygen needed by micro-organisms to decompose (oxidise) the biodegradable organic matter present in one litre of water.

Effluents of the sugar industry, dairy industry and domestic sewage are rich in biodegradable organic matter, so BOD measures their pollution well.

Effluents of the petroleum industry contain mostly non-biodegradable and toxic substances (hydrocarbons, heavy metals) that micro-organisms cannot readily oxidise.

BOD may not be a good index of pollution for water receiving petroleum industry effluents.

Answer: (1)

Out of syllabusNEET 2016 (Phase 2)

Keep practising — Environmental Issues

2

A lake which is rich in organic waste may result in

  1. mortality of fish due to lack of oxygen
  2. increased population of fish due to lots of nutrients
  3. increased population of aquatic organisms due to minerals
  4. drying of the lake due to algal bloom
Out of syllabusNEET 2016 (Phase 2)
3

The highest DDT concentration in aquatic food chain shall occur in

  1. crab
  2. Phytoplankton
  3. eel
  4. seagull
Out of syllabusNEET 2016 (Phase 2)
4

Acid rain is caused by increase in the atmospheric concentration of -

  1. SO3 and CO
  2. CO2 and CO
  3. O3 and dust
  4. SO2 and NO2
Out of syllabusAIPMT 2015
5

Eutrophication of water bodies leading to killing of fishes is mainly due to nonavailability of

  1. light
  2. food
  3. essential minerals
  4. oxygen
Out of syllabusAIPMT 2015
6

The UN conference of Parties on climate change in the year 2012 was held at:

  1. Lima
  2. Warsaw
  3. Doha
  4. Durban
Out of syllabusAIPMT 2015
7

Which of the following are most suitable indicators of SO2 pollution in the environment?

  1. Conifers
  2. Fungi
  3. Algae
  4. Lichens
Out of syllabusAIPMT 2015
8

Increase in concentration of the toxicant at successive trophic levels is known as:

  1. Biomagnification
  2. Biotransformation
  3. Biodeterioration
  4. Biogeochemical cycling
Out of syllabusAIPMT 2015
9

The UN Conference of Parties on climate change in the year 2011 was held in :

  1. Peru
  2. Qatar
  3. Poland
  4. South Africa
Out of syllabusAIPMT 2015 (Cancelled)
10

Which of the following is not one of the prime health risks associated with greater UV radiation through the atmosphere due to depletion of stratospheric ozone?

  1. Increased liver cancer
  2. Increased skin cancer
  3. Damage to eyes
  4. Reduced Immune System
Out of syllabusAIPMT 2015 (Cancelled)
11

High value of BOD (Biochemical Oxygen Demand) indicates that :

  1. water is highly polluted
  2. consumption of organic matter in the water is higher by the microbes
  3. water is pure
  4. water is less polluted
Out of syllabusAIPMT 2015 (Cancelled)

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