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CBSE Class 10 Environmental & Disaster Management — practice questions — page 3

Explore 81 free Environmental & Disaster Management questions in CBSE Class 10 Science. Open each question or exercise to read its content, reference answers and available explanation.

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Environmental & Disaster Management questions and exercises with answers

Showing questions 61–81 of 81.

Increased UV radiation due to ozone depletion can cause:Read the answer and worked solution →Which group of organisms recycles nutrients in an ecosystem?Read the answer and worked solution →Composting kitchen waste at home contributes to:Read the answer and worked solution →The Tyndall effect in air refers to scattering of light by:Read the answer and worked solution →In a food chain "Grass → Deer → Tiger", which trophic level has the LEAST energy available?Read the answer and worked solution →The flow chart "Sun → producer → consumer → decomposer" describes:Read the answer and worked solution →The process by which green plants make their food using sunlight is:Read the answer and worked solution →The chemical equation for cellular respiration in humans is:Read the answer and worked solution →The functional unit of the kidney is the:Read the answer and worked solution →Stomata on leaves help in:Read the answer and worked solution →Blood from the lungs returns to the heart through:Read the answer and worked solution →Bile is produced by the:Read the answer and worked solution →The enzyme that digests starch (in human saliva) is:Read the answer and worked solution →Xylem transports:Read the answer and worked solution →The site of cellular respiration in human cells is the:Read the answer and worked solution →The opening between vocal cords through which air passes into the windpipe is called:Read the answer and worked solution →The respiratory PIGMENT in human blood that carries oxygen is:Read the answer and worked solution →The double-circulation system of mammals means:Read the answer and worked solution →Bile DOES NOT contain any digestive enzyme, yet it AIDS in digestion of fats because it:Read the answer and worked solution →The semi-permeable membrane of glomerulus and Bowman's capsule, where blood is filtered, is called the:Read the answer and worked solution →Anaerobic respiration in human muscles produces:Read the answer and worked solution →

Worked practice questions

Increased UV radiation due to ozone depletion can cause:

  1. Increase in oxygen levels (option)
  2. Cooling of the Earth
  3. Skin cancers and cataracts in humans
  4. Acid rain
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Correct answer: C. Skin cancers and cataracts in humans

1. UV damages DNA in skin cells, leading to skin cancers. 2. It also damages the lens of the eye, contributing to cataracts. 3. Marine ecosystems also suffer reduced phytoplankton growth. _Source: syllabus Science, Ch 13 "Our Environment", §13.2.1_

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Which group of organisms recycles nutrients in an ecosystem?

  1. Decomposers
  2. Producers
  3. Herbivores
  4. Top carnivores
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Correct answer: A. Decomposers

1. Decomposers (bacteria and fungi) act on dead organisms. 2. They release nutrients back into the soil and atmosphere. 3. Producers re-absorb these nutrients to grow. _Source: syllabus Science, Ch 13 "Our Environment", §13.1_

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Composting kitchen waste at home contributes to:

  1. Producing CFCs
  2. Increasing UV exposure (option)
  3. Raising sea levels
  4. Reducing landfill burden and producing organic manure
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Correct answer: D. Reducing landfill burden and producing organic manure

1. Biodegradable kitchen waste breaks down with the help of microbes and worms. 2. The product is nutrient-rich compost usable as manure. 3. Diverting kitchen waste from landfills reduces methane emissions too. _Source: syllabus Science, Ch 13 "Our Environment", §13.2.2_

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More Science topics

Refraction of Light and LensesEffects of Electric CurrentChemical Reactions and EquationsLife Processes in Living Organisms Part 2Life Processes in Living Organisms Part 1Metals and Non-metalsAcids, Bases and SaltsCarbon Compounds