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IAS Exam: Prelims Environment and Ecology Questions: Degradation of natural environment

Jan 29, 2016 17:35 IST

    Environment and Ecology has become indispensable for IAS Prelims Exam. Candidates cannot dispense with this section. In future also Importance of Environment and Ecology cannot be underestimated. Following are some MCQs that would help candidates to understand the kinds of questions they are going to face from Environment and Ecology section in IAS Prelims Exam:

    Q1. Multi-cropping refers to
    a. growing of variety of food crops in a field
    b. poultry farming and growing of food crops.
    c. Growing of food, fodder and firewood crops together
    d. Growing of food, fodder and firewood crops together along with poultry farming

    Answer: c

    Explanation: Multi-cropping system refers to growing of food crops, fodder, and firewood crops together in a field.

    Q2. With reference to deforestation, which of the following of the following are reasons for clearing forest?
    1. Need for land
    2. For pastures
    3. Shifting cultivation
    4. Silting
    5. Loss of wild habitat

    Select the correct answer from the following codes
    a. Only 1
    b. Only 1, 2 and 3
    c. Only 1, 3 and 4
    d. 1,2,3 and 5

    Answer: b

    Explanation: Forest has been cleared for developmental activities, for timber and wood, for pastures, shifting cultivation. Silting and loss of wild habitat are consequences of deforestation.

    Q3. Which of the following are consequences of deforestation?
    1. Silting
    2.Loss of wild habitat
    3. Loss of CO2 sink
    4. Pollution

    Select the correct answer from the following codes
    a. Only 3
    b. Only 2 and 3
    c. Only 1,3 and 4
    d. 1,2,3 and 4

    Answer: d

    Explanation: Loss of trees from forest also causes silting of rivers and lakes as loose soil gets washed with rain water and reaches water bodies.

    Q4. Which of the following are environmental degradation from mining?
    1. Land subsidence
    2. Pollution by agrochemicals
    3. Depletion of minerals
    4. Dumping of debris

    Select the correct answer from the following codes
    a. Only 1
    b. Only 1 and 2
    c. 1,2 ,3and 4
    d. 1,3 and 4

    Answer: d

    Explanation: Loss of vegetation, depletion of minerals, dumping of debris, land subsidence are environmental degradation from mining.

    Q5. Which of the following are impact of modernised agriculture on environment?
    1. Monoculture
    2. Pollution by agrochemicals
    3. Water logging
    4. Transition of forests into farmlands

    Select the correct answer from the following codes
    a. Only 2
    b. Only 2,3 and 4
    c. Only 1 and 2
    d. 1,2 ,3 and 4

    Answer: d

    Explanation:  Traditional agriculture was based on multi-cropping system. This practice had been replaced by monoculture i.e. growing of only one kind of crop.

    Q6. Which of the following can be addressed as global environmental backlash?
    1. Ozone layer depletion
    2. Green house effect
    3. Acid rain
    4. Oil spills
    5. Drought

    Select the correct answer from the following codes
    a. Only 1 and 2
    b. Only 2, 3 and 5
    c. Only1,  2 and 5
    d. 1,3,4 and 5

    Answer: a

    Explanation: Regional environmental backlash are floods, droughts, acid rain, oil spills. Global backlash are biodiversity loss, green house effect, collapse of marine fisheries, ozone layer depletion.

    Click here for IAS Prelims: GS Environment and Ecology: Study Material

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