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Environmental Issues · Question 26

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

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

Answer

(1) mortality of fish due to lack of oxygen

Solution

Organic waste in water is decomposed by micro-organisms, which consume a large amount of dissolved oxygen in the process (high BOD).

As per NCERT, this causes a sharp decline in dissolved oxygen downstream of the point of discharge, resulting in the mortality of fish and other aquatic creatures.

Answer: (1)

Out of syllabusNEET 2016 (Phase 2)

Keep practising — Environmental Issues

2

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)
3

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
4

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
5

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
6

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
7

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
8

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)
9

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)
10

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)
11

Rachel Carson's famous book "Silent Spring" is related to:

  1. Population explosion
  2. Pesticide pollution
  3. Ecosystem management
  4. Noise pollution
Out of syllabusAIPMT 2015 (Cancelled)

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