Environment

1

Consider the following statements:

The Environment Protection Act, 1986 empowers the Government of India to

  1. state the requirement of public participation in the process of environmental protection, and the procedure and manner in which it is sought
  2. lay down the standards for emission or discharge of environmental pollutants from various sources

Which of the statements given above is / are correct?

(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

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2

In India, the use of carbofuran, methylparathion, phorate and triazophos is viewed with apprehension. These chemicals are used as

  1. pesticides in agriculture
  2. preservatives in processed foods
  3. fruit-ripening agents
  4. moisturising agents in cosmetics
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3

Which of the following statements are correct about the deposits of methane hydrate?

  1. Global warming might trigger the release of methane gas from these deposits.
  2. Large deposits of 'methane hydrate' are found in Arctic Tundra and under the seafloor.
  3. Methane in atmosphere oxidizes to carbon dioxide after a decade or two.

Select the correct answer using the code given below.

  1. 1 and 2 only
  2. 2 and 3 only
  3. 1 and 3 only
  4. 1, 2 and 3
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4

Why is there a great concern about the 'microbeads' that are released into environment?

  1. The are considered harmful to marine ecosystems.
  2. They are considered to cause skin cancer in children.
  3. They are small enough to be absorbed by crop plants in irrigated fields.
  4. They are often found to be used as food adulterants.
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5

In the context of which one of the following are the terms 'pyrolysis and plasma gasification' mentioned?

  1. Extraction of rare earth elements
  2. Natural gas extraction technologies
  3. Hydrogen fuel-based automobiles
  4. Waste-to-energy technologies
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6

In the context of which of the following do some scientists suggest the use of cirrus cloud thinning technique and the injection of sulphate aerosol into stratosphere?

  1. Creating the artificial rains in some regions
  2. Reducing the frequency and intensity of tropical cyclones
  3. Reducing the adverse effects of solar wind on the Earth
  4. Reducing the global warming
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7

The poisonous nature of carbon monoxide (CO) is due to its

  1. insolubility in water
  2. ability to form a complex with haemoglobin
  3. ability to reduce some metal oxides
  4. property of having one sigma bond
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8

Which one of the following is a cause of acid rains?

  1. Ozone
  2. Ammonia
  3. Sulphur dioxide
  4. Carbon monoxide
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9

Which one of the following gases is placed second in respect of abundance in the Earth's atmosphere?

  1. Oxygen
  2. Hydrogen
  3. Nitrogen
  4. Carbon dioxide
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10

The percentage of solar radiation absorbed by all the green plants for the process of photosynthesis is about

  1. 1%
  2. 5%
  3. 8%
  4. 10%
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11

Which group of organisms are not constituents of a food chain?

  1. Grass, lion, rabbit, wolf
  2. Plankton, man, fish, grasshopper
  3. Wolf, grass, snake, tiger
  4. Frog, snake, eagle, grass, grasshopper

Select the correct option:

  1. (i) and (iii)
  2. (iii) and (iv)
  3. (ii) and (iii)
  4. (i) and (iv)
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12

Flow of energy in an ecosystem is always

  1. unidirectional
  2. bidirectional
  3. multi directional
  4. no specific direction
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13

In the given food chain, suppose the amount of energy at fourth trophic level is 5 kJ, what will be the energy available at the producer level?
Grass → Grasshopper → Frog → Snake → Hawk

  1. 5 kJ
  2. 50 kJ
  3. 500 kJ
  4. 5000 kJ
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14

In a food chain, the third trophic level is always occupied by

  1. carnivores
  2. herbivores
  3. decomposers
  4. producers
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15

The process of nitrogen-fixation by bacteria does not take place in the presence of

  1. molecular form of hydrogen
  2. elemental form of oxygen
  3. water
  4. elemental form of nitrogen
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16

The branchy part of a tree above the stem is known as

  1. crown
  2. canopy
  3. sapling
  4. humus
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17

The coldest region on earth is the

  1. polar region
  2. tropical region
  3. temperate region
  4. coastal region
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18

The method of preparing compost with the help of earthworms is called

  1. composting
  2. vermicomposting
  3. manuring
  4. decomposing
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