UPSC solved previous year questions

UPSC Environment and ecology PYQ with Answers

42 solved Environment and ecology questions from previous UPSC papers, each with an answer and explanation.

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Questions
42
Years covered
2017–2024
Exam years
4
With answers
42

Environment and ecology questions by year

20242 2019 🔒18 2018 🔒15 2017 🔒7

UPSC Environment and ecology PYQ with Answers

1–2 of 2
  1. Q1 2024 Prelims GS

    Consider the following materials:
    1. Agricultural residues
    2. Corn grain
    3. Wastewater treatment sludge
    4. Wood mill waste
    Which of the above can be used as feedstock for producing Sustainable Aviation Fuel?

    1. 1 and 2 only
    2. 3 and 4 only
    3. 1, 2, 3 and 4✓
    4. 1, 3 and 4 only
    Answer explanation

    1, 2, 3 and 4 All four materials can serve as feedstocks for producing Sustainable Aviation Fuel (SAF) through suitable conversion pathways.…

    Biofuel feedstocksEnvironment and ecologySustainable aviation fuel
    Read full explanation
  2. Q2 2024 Prelims GS

    According to the Environmental Protection Agency (EPA), which one of the following is the largest source of sulphur dioxide emissions?

    1. Locomotives using fossil fuels
    2. Ships using fossil fuels
    3. Extraction of metals from ores
    4. Power plants using fossil fuels✓
    Answer explanation

    Power plants using fossil fuels According to the EPA's commonly cited emissions information, fossil-fuel-fired power plants—particularly those burning coal—are a major and the largest listed source of sulphur dioxide emissions.…

    Air pollutionEnvironment and ecologyMajor emission sources
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