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State PSC Environment & Ecology — practice questions — page 4

Explore 332 free Environment & Ecology questions in State PSC Environment. Open each question or exercise to read its content, reference answers and available explanation.

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Environment & Ecology questions and exercises with answers

Showing questions 91–120 of 332.

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 →Catch the escapes in timeRead the answer and worked solution →Pop the population interactionsRead the answer and worked solution →Run the adaptationsRead the answer and worked solution →Slice the population wordsRead the answer and worked solution →Grow or shrinkRead the answer and worked solution →Sort the interactionsRead the answer and worked solution →

Worked practice questions

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Questions
  1. Answer
    10
    Question
    Per cent of energy passed to the next trophic level
  2. Answer
    50
    Question
    Upper per cent of sunlight that is PAR
  3. Answer
    170
    Question
    Biosphere net primary productivity in billion tons
  4. Answer
    49
    Question
    Per cent carbon in dry weight of organisms
  5. Answer
    71
    Question
    Per cent of global carbon dissolved in oceans
  6. Answer
    33
    Question
    Value of ecosystem services in trillion dollars
Instructions
Type the number only.
_Source: syllabus Biology, Chapter 14, Ecosystem._

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Ecosystem bingo

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Clues and terms
  1. Clue
    Total organic matter made by photosynthesis.
    Item
    GPP
  2. Clue
    GPP minus respiration.
    Item
    NPP
  3. Clue
    Dead remains, raw material for decay.
    Item
    Detritus
  4. Clue
    Dark resistant organic matter.
    Item
    Humus
  5. Clue
    Decomposer feeding on dead matter.
    Item
    Saprotroph
  6. Clue
    Living mass at one trophic level.
    Item
    Standing crop
  7. Clue
    Stable final community.
    Item
    Climax
  8. Clue
    First species on bare ground.
    Item
    Pioneer
  9. Clue
    Another name for nutrient cycling.
    Item
    Biogeochemical
Instructions
Read each clue and tap the term it describes.
_Source: syllabus Biology, Chapter 14, Ecosystem._

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Organisms that tolerate a wide range of temperatures are called:

  1. Eurythermal
  2. Stenothermal
  3. Euryhaline
  4. Stenohaline
Show answer and solution

Correct answer: A. Eurythermal

1. Most organisms live within a narrow range. 2. Wide-range organisms are eurythermal. 3. Thermal tolerance shapes geographical distribution. _Source: syllabus Biology, Chapter 13, Organisms and Populations._

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