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Environmental Issues · Question 24

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

A river with an inflow of domestic sewage rich in organic waste may result in -

  1. Death of fish due to lack of oxygen
  2. Increased population of aquatic food web organisms
  3. Drying of the river very soon due to algal bloom
  4. An increased production of fish due to biodegradable nutrients

Answer

(1) Death of fish due to lack of oxygen

Solution

As per NCERT, micro-organisms decompose the biodegradable organic matter of sewage and consume a lot of oxygen in the process.

BOD of the water rises sharply and the dissolved oxygen falls.

Fish and other aquatic organisms die due to lack of oxygen.

Answer: (1)

Out of syllabusNEET 2016 (Phase 1)

Keep practising — Environmental Issues

2

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
Out of syllabusNEET 2016 (Phase 2)
3

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)
4

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)
5

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
6

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
7

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
8

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
9

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
10

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)
11

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)

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