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DSSSB TGT Our Environment — practice questions

Explore 5 free Our Environment questions in DSSSB TGT Science. Open each question or exercise to read its content, reference answers and available explanation.

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Our Environment questions and exercises with answers

Showing questions 1–5 of 5.

Which of the following is a DECOMPOSER in a typical ecosystem?Read the answer and worked solution →The ozone layer protects life on Earth by:Read the answer and worked solution →Which of the following is BIODEGRADABLE waste?Read the answer and worked solution →The principle of '3 R's' for environmental conservation refers to:Read the answer and worked solution →Rule on these claims about a food chainRead the answer and worked solution →

Worked practice questions

Which of the following is a DECOMPOSER in a typical ecosystem?

  1. Tiger in a forest food chain ecosystem
  2. Mango tree in a garden ecosystem
  3. Bacteria breaking dead leaves in soil
  4. Wheat plant in a Punjab field farm
Show answer and solution

Correct answer: C. Bacteria breaking dead leaves in soil

Decomposers break down dead organic matter into simple compounds, recycling nutrients to soil. Bacteria and fungi are the main decomposers.

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The ozone layer protects life on Earth by:

  1. Reflecting visible sunlight back into space at noon
  2. Holding Earth's heat through the greenhouse effect
  3. Generating breathable oxygen continuously each day
  4. Blocking harmful UV-B and UV-C radiation from the Sun
Show answer and solution

Correct answer: D. Blocking harmful UV-B and UV-C radiation from the Sun

Ozone in the stratosphere blocks harmful UV-B and UV-C radiation. Without it, skin cancer, cataracts, and ecological damage would surge.

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Which of the following is BIODEGRADABLE waste?

  1. Plastic bags and disposable bottles
  2. Glass containers and aluminium cans
  3. Vegetable peels and dry tree leaves
  4. Mercury-bearing batteries and CFL lamps
Show answer and solution

Correct answer: C. Vegetable peels and dry tree leaves

Biodegradable waste is broken down by microorganisms: vegetable peels, tree leaves, paper, cloth, kitchen waste. Plastic, glass, metals and batteries are non-biodegradable.

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How to practise

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More Science topics

Life ProcessesScienceChemical Reactions and EquationsElectricityCarbon and its CompoundsMetals and Non-metalsAcids, Bases and SaltsAcids Bases Salts