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Environmental Issues · Question 21

NEET 2016 (Phase 1)MCQEasy📈 Topic in 0% papers+4−1
1

A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called -

  1. Shifting agriculture
  2. Strip farming
  3. Ley farming
  4. Contour farming

Answer

(3) Ley farming

Solution

Ley farming is the practice of growing crops in rotation with a legume or grass pasture (ley) for a few years; the pasture adds organic matter and nitrogen and improves soil structure and fertility.

Shifting agriculture is slash-and-burn cultivation; strip farming and contour farming are methods of checking soil erosion on slopes.

Answer: (3)

Out of syllabusNEET 2016 (Phase 1)

Keep practising — Environmental Issues

2

Depletion of which gas in the atmosphere can lead to an increased incidence of skin cancers

  1. Methane
  2. Ozone
  3. Nitrous oxide
  4. Ammonia
Out of syllabusNEET 2016 (Phase 1)
3

Joint Forest Management Concept was introduced in India during :

  1. 1990s
  2. 1970s
  3. 1960s
  4. 1980s
Out of syllabusNEET 2016 (Phase 1)
4

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
Out of syllabusNEET 2016 (Phase 1)
5

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)
6

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)
7

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)
8

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
9

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
10

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
11

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

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