PYQSide ExamsMy practice

Environmental Issues · Question 63

AIPMT 2008MCQMedium📈 Topic in 12% papers+4−1
1

A lake near a village suffered heavy mortality of fishes within a few days. Consider the following reasons for this: (i) Lots of urea and phosphate fertilizer were used in the crops in the vicinity (ii) The area was sprayed with DDT by an aircraft (iii) The lake water turned green and stinky (iv) Phytoplankton populations in the lake declined initially thereby greatly reducing photosynthesis Which two of the above were the main causes of fish mortality in the lake?

  1. (i), (ii)
  2. (iii), (iv)
  3. (i), (iii)
  4. (ii), (iii)

Answer

(1) (i), (ii)

Solution

(i) Run-off of urea and phosphate fertilizers adds nutrients to the lake eutrophication and algal bloom; decomposition of the algae depletes dissolved oxygen fishes die.

(ii) DDT sprayed over the area is washed into the lake; DDT is highly toxic to fishes and, as per NCERT, it is biomagnified in aquatic food chains fishes die.

(iii) Green, stinky water is only a result (symptom) of eutrophication, not a cause by itself.

(iv) is incorrect: nutrient enrichment increases phytoplankton initially; it does not decline.

The main causes of fish mortality are (i) and (ii).

Answer: (1)

Out of syllabusAIPMT 2008

Keep practising — Environmental Issues

2

According to Central Pollution Control Board (CPCB), which particulate size in diameter (in micrometers) of the air pollutants is responsible for greatest harm to human health?

  1. 2.5 or less
  2. 1.5 or less
  3. 1.0 or less
  4. 5.2–2.5
Out of syllabusAIPMT 2008
3

Which one of the following is the correct percentage of the two (out of the total of 4) greenhouse gases that contribute to the total global warming?

  1. CFCs 14%, Methane 20%
  2. CO2 40%, CFCs 30%
  3. N2O 6%, CO2 86%
  4. Methane 20%, N2O 18%
Out of syllabusAIPMT 2008
4

In which one of the following the BOD (Biochemical Oxygen Demand) of sewage (S), distillery effluent (DE), paper mill effluent (PE) and sugar mill effluent (SE) have been arranged in ascending order?

  1. SE < PE < S < DE
  2. SE < S < PE < DE
  3. PE < S < SE < DE
  4. S < DE < PE < SE
Out of syllabusAIPMT 2007
5

In a coal fired power plant electrostatic precipitators are installed to control emission of:-

  1. SPM
  2. SO2
  3. CO
  4. NOx
Out of syllabusAIPMT 2007
6

Which one of the following is not a bioindicator of water pollution?

  1. Blood-worms
  2. Stone flies
  3. Sewage fungus
  4. Sludge-worms
Out of syllabusAIPMT 2007
7

Limit of BOD prescribed by Central Pollution Control Board for the discharge of industrial and municipal waste waters into natural surface waters, is -

  1. <30 ppm
  2. <3.0 ppm
  3. <100 ppm
  4. <10 ppm
Out of syllabusAIPMT 2006
8

Photochemical smog pollution does not contain-

  1. Nitrogen dioxide
  2. PAN (peroxy acyl nitrate)
  3. Ozone
  4. Carbon dioxide
Out of syllabusAIPMT 2006
9

Montreal Protocol which calls for appropriate action to protect the ozone layer from human activities was passed in the year-

  1. 1988
  2. 1986
  3. 1985
  4. 1987
Out of syllabusAIPMT 2006
10

Prolonged liberal irrigation of agricultural fields is likely to create the problem of -

  1. Salinity
  2. Acidity
  3. Aridity
  4. Metal toxicity
Out of syllabusAIPMT 2005
11

Which of the following is not used for disinfection of drinking water ?

  1. Chloramine
  2. Ozone
  3. Chlorine
  4. Phenyle
Out of syllabusAIPMT 2005

All Environmental Issues PYQs →

PDFDownload Environmental Issues PYQs as PDF Free, with answer key and a QR code to every solution — print it or study offline⬇
All NEET Botany chapters
Class 11The Living WorldBiological ClassificationPlant KingdomMorphology of Flowering PlantsAnatomy of Flowering PlantsCell: The Unit of LifeCell Cycle and Cell DivisionTransport in PlantsMineral NutritionPhotosynthesis in Higher PlantsRespiration in PlantsPlant Growth and Development
Class 12Reproduction in OrganismsSexual Reproduction in Flowering PlantsPrinciples of Inheritance and VariationMolecular Basis of InheritanceStrategies for Enhancement in Food ProductionMicrobes in Human WelfareOrganisms and PopulationsEcosystemBiodiversity and ConservationEnvironmental Issues
Other chaptersBiomolecules (Biology)