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UPSC CDS Science & Technology — practice questions — page 2

Explore 248 free Science & Technology questions in UPSC CDS Environment. Open each question or exercise to read its content, reference answers and available explanation.

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Science & Technology questions and exercises with answers

Showing questions 31–60 of 248.

Catch the decomposition stepsRead the answer and worked solution →Pop the succession wordsRead the answer and worked solution →Run the ecosystem numbersRead the answer and worked solution →Slice the ecosystem wordsRead the answer and worked solution →Gaseous or sedimentary cycleRead the answer and worked solution →Sort producers, consumers and decomposersRead the answer and worked solution →Type the numberRead the answer and worked solution →Ecosystem bingoRead the answer and worked solution →Organisms that tolerate a wide range of temperatures are called:Read the answer and worked solution →What share of animals and nearly all plants cannot maintain a constant internal environment?Read the answer and worked solution →Every winter Keoladeo National Park at Bharatpur hosts migratory birds from:Read the answer and worked solution →Bears escaping winter cold by sleeping through it show:Read the answer and worked solution →Snails and fish avoiding summer heat and desiccation enter:Read the answer and worked solution →Which desert animal meets all its water needs through internal fat oxidation?Read the answer and worked solution →Seals in polar seas keep warm with a thick layer of fat called:Read the answer and worked solution →The tiger census in Indian reserves is often based on:Read the answer and worked solution →Which two processes increase population density?Read the answer and worked solution →Individuals of the same species entering a habitat from elsewhere is:Read the answer and worked solution →In 1981 the intrinsic rate of natural increase for India's human population was:Read the answer and worked solution →The Verhulst-Pearl model describes which type of growth?Read the answer and worked solution →In the logistic growth equation, K stands for:Read the answer and worked solution →An interaction in which one species is harmed and the other unaffected is:Read the answer and worked solution →Removal of the starfish Pisaster from an intertidal area led to:Read the answer and worked solution →Nearly what share of all insects are phytophagous?Read the answer and worked solution →The Abingdon tortoise of the Galapagos became extinct after the introduction of:Read the answer and worked solution →The Competitive Exclusion Principle is credited to:Read the answer and worked solution →Lice on humans and ticks on dogs are examples of:Read the answer and worked solution →An orchid growing as an epiphyte on a mango branch is an example of:Read the answer and worked solution →The cattle egret foraging beside grazing cattle is a classic case of:Read the answer and worked solution →The Mediterranean orchid Ophrys gets pollinated by:Read the answer and worked solution →

Worked practice questions

Catch the decomposition steps

Read exercise and reference answers
Items
  1. Matches the category
    Yes
    Item
    Fragmentation
  2. Matches the category
    Yes
    Item
    Leaching
  3. Matches the category
    Yes
    Item
    Catabolism
  4. Matches the category
    Yes
    Item
    Humification
  5. Matches the category
    Yes
    Item
    Mineralisation
  6. Matches the category
    No
    Item
    Photosynthesis
  7. Matches the category
    No
    Item
    Respiration
  8. Matches the category
    No
    Item
    Succession
Category
Decomposition step
Instructions
Catch the steps of decomposition. Let the other processes fall.
_Source: syllabus Biology, Chapter 14, Ecosystem._

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Pop the succession words

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Other terms
  1. GPP
  2. NPP
  3. Detritus
  4. Humus
Matching terms
  1. Climax
  2. Pioneer
  3. Sere
  4. Hydrarch
  5. Xerarch
  6. Lichens
Instructions
Pop the words about ecological succession. Leave the productivity words.
_Source: syllabus Biology, Chapter 14, Ecosystem._

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Run the ecosystem numbers

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Questions
  1. Correct
    Under 50
    Choices
    1. Under 50
    2. 2 to 10
    3. 10
  2. Correct
    2 to 10
    Choices
    1. Under 50
    2. 2 to 10
    3. 10
  3. Correct
    10
    Choices
    1. Under 50
    2. 2 to 10
    3. 10
  4. Correct
    49
    Choices
    1. 49
    2. 71
    3. 1
  5. Correct
    71
    Choices
    1. 49
    2. 71
    3. 1
  6. Correct
    1
    Choices
    1. 49
    2. 71
    3. 1
Instructions
Per cent: sunlight as PAR, PAR plants capture, energy passed on; then carbon in dry weight, oceans, air.
_Source: syllabus Biology, Chapter 14, Ecosystem._

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