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Delhi University Entrance Test (DUET) 2020 Previous Year Question Paper With Answer Key

This post was last modified on 27 December 2020

DUET Last 10 Years 2011-2021 Question Papers With Answer Key || Delhi University Entrance Test conducted by the NTA


Firstranker's choice www.FirstRanker.com

Topic:- ES MSC S2N

DU MSC Environment

--- Content provided by FirstRanker.com ---


  1. Which of the following is thought to be a possible consequence of rising CO2 levels?

    [Question ID = 10618]

    1. Increased breakdown of atmospheric ozone [Option ID - 42466]
    2. Increased vegetative productivity [Option ID - 42467]
    3. Falling global temperature [Option ID - 42468]
    4. --- Content provided by​ FirstRanker.com ---

    5. More rapid warming at the equator than at the poles [Option ID - 42469]

    Correct Answer :-

    • Increased vegetative productivity [Option ID - 42467]
  2. When climbing a mountain, we can observe transitions in biological communities that are analogous to the changes:

    --- Content provided by​ FirstRanker.com ---

    [Question ID = 10619]

    1. at different depths in the ocean [Option ID - 42470]
    2. in a community through different seasons [Option ID - 42471]
    3. in an ecosystem as it evolves over time [Option ID - 42472]
    4. in biomes at different latitudes [Option ID - 42473]
    5. --- Content provided by‍ FirstRanker.com ---

    Correct Answer:-

    • in biomes at different latitudes [Option ID 42473]
  3. What do diversity indices such as the Shannon Index take into account?

    [Question ID = 10620]

    --- Content provided by‌ FirstRanker.com ---

    1. Alpha diversity and beta diversity [Option ID - 42474]
    2. Evenness and beta diversity [Option ID - 42475]
    3. Species richness and evenness [Option ID - 42476]
    4. Species richness and beta diversity [Option ID - 42477]

    Correct Answer :-

    --- Content provided by FirstRanker.com ---

    • Species richness and evenness [Option ID - 42476]
  4. The theory that primary productivity is limited by whichever necessary metabolic requirement is present in the least supply relative to demand is known as:

    [Question ID = 10621]

    1. Law of minimum metabolic requirement [Option ID - 42478]
    2. --- Content provided by‌ FirstRanker.com ---

    3. Minimum metabolic requirement [Option ID - 42479]
    4. Principle of limiting factors [Option ID - 42480]
    5. Theory of the minimum metabolic requirement [Option ID - 42481]

    Correct Answer :-

    • Principle of limiting factors [Option ID - 42480]
    • --- Content provided by FirstRanker.com ---

  5. A variable that is affected by and responds to changes in the manipulated variable is called:

    [Question ID = 10622]

    1. controlled variable [Option ID - 42482]
    2. dependent variable [Option ID - 42483]
    3. --- Content provided by FirstRanker.com ---

    4. independent variable [Option ID - 42484]
    5. random variable [Option ID - 42485]

    Correct Answer :-

    • dependent variable (Option ID - 42483]
  6. --- Content provided by‌ FirstRanker.com ---

  7. In a frequency distribution graph, frequencies are presented on the ________ and the scores (categories) are listed on the ________.

    [Question ID = 10623]

    1. Class interval/horizontal line [Option ID - 42486]
    2. Horizontal line/vertical line [Option ID - 42487]
    3. X axis /Y axis [Option ID - 42488]
    4. --- Content provided by‍ FirstRanker.com ---

    5. Y axis/X axis [Option ID - 42489]

    Correct Answer:-

    • Y axis/X axis [Option ID - 42489]
  8. Which of the following international conventions restricts international trade in endangered species?

    --- Content provided by‌ FirstRanker.com ---

    [Question ID = 10624]

    1. CBD [Option ID - 42490]
    2. CITES [Option ID - 42491]

    Correct Answer :-

    • CITES [Option ID - 42491]
    • --- Content provided by⁠ FirstRanker.com ---

  9. An ecological footprint is:

    [Question ID = 10625]

    1. a measure of the earth's biological capacity [Option ID - 42494]
    2. amount of wilderness available on earth [Option ID - 42495]
    3. --- Content provided by‌ FirstRanker.com ---

    4. amount of biologically productive land and water a person uses [Option ID - 42496]
    5. a measure of a person's contribution to creating a sustainable environment [Option ID - 42497]

    Correct Answer:-

    • amount of biologically productive land and water a person uses [Option ID - 42496]
  10. --- Content provided by⁠ FirstRanker.com ---

  11. What is the difference between an endangered species and a threatened species?

    [Question ID = 10626]

    1. A threatened species may still be abundant now but likely to become endangered in the near future [Option ID - 42498]
    2. A threatened species is at the brink of extinction now and an endangered species is likely to be at the brink in the near future [Option ID - 42499]
    3. A threatened species is becoming endangered specifically because of human activities [Option ID - 42500]
    4. --- Content provided by FirstRanker.com ---

    5. There is no difference. The two terms are interchangeable [Option ID - 42501]

    Correct Answer :-

    • A threatened species may still be abundant now but likely to become endangered in the near future [Option ID - 42498]
  12. When a doctor uses a stethoscope to count your pulse rate, she is gathering information by using the ________:

    --- Content provided by FirstRanker.com ---

    [Question ID = 10627]

    1. empirical method [Option ID - 42502]
    2. method of intuition [Option ID - 42503]
    3. method of authority [Option ID - 42504]
    4. rational method [Option ID 42505]
    5. --- Content provided by​ FirstRanker.com ---

    Correct Answer :-

    • empirical method [Option ID - 42502]
  13. The maximum per capita rate of increase achieved by a species under ideal environmental conditions is called the:

    [Question ID = 10628]

    --- Content provided by‌ FirstRanker.com ---

    1. inherent rate of increase [Option ID - 42506]
    2. inherent growth rate [Option ID - 42507]
    3. intrinsic growth rate [Option ID - 42508]
    4. intrinsic rate of increase [Option ID - 42509]

    Correct Answer:-

    --- Content provided by​ FirstRanker.com ---

    • intrinsic rate of increase [Option ID - 42509]
  14. What is the Lotka-Volterra competition model based on?

    [Question ID = 10629]

    1. Exponential population growth equation [Option ID - 42510]
    2. --- Content provided by FirstRanker.com ---

    3. Life table equation [Option ID - 42511]
    4. Logistic population growth equation [Option ID - 42512]
    5. Realized per capita growth rate equation [Option ID - 42513]

    Correct Answer :-

    • Logistic population growth equation [Option ID - 42512]
    • --- Content provided by‌ FirstRanker.com ---

  15. The best measure of central tendency for an extremely skewed distribution of scores would be ________.

    [Question ID = 10630]

    1. cannot be determined [Option ID - 42514]
    2. the mean [Option ID - 42515]
    3. --- Content provided by‌ FirstRanker.com ---

    4. the median [Option ID - 42516]
    5. the mode [Option ID - 42517]

    Correct Answer :-

    • the median [Option ID - 42516]
  16. --- Content provided by⁠ FirstRanker.com ---

  17. Trade winds are the prevailing pattern of surface winds. The factors determining patterns of these winds are:

    [Question ID = 10631]

    1. gravitational field of Planet Earth [Option ID - 42518]
    2. rotational pattern of Earth [Option ID - 42519]
    3. uneven surface temperature [Option ID - 42520]
    4. --- Content provided by FirstRanker.com ---

    5. Coriolis effect [Option ID - 42521]

    Correct Answer :-

    • uneven surface temperature [Option ID - 42520]
  18. Which of the following shows the correct order of soil texture from larger to smaller diameters?

    --- Content provided by FirstRanker.com ---

    [Question ID = 10632]

    1. Gravel, sand, clay, and silt [Option ID - 42522]
    2. Gravel, sand, silt, and clay [Option ID - 42523]
    3. Gravel, silt, sand, and clay [Option ID - 42524]
    4. Sand, gravel, silt, and clay [Option ID - 42525]
    5. --- Content provided by‍ FirstRanker.com ---

    Correct Answer :-

    • Gravel, sand, silt, and clay [Option ID - 42523]
  19. All members in which of the following groups have the greatest number of characteristics in common?

    [Question ID = 10633]

    --- Content provided by‍ FirstRanker.com ---

    1. Class [Option ID - 42526]
    2. Genus [Option ID - 42527]
    3. Phylum [Option ID - 42528]
    4. Species [Option ID - 42529]

    Correct Answer:-

    --- Content provided by‌ FirstRanker.com ---

    • Species [Option ID - 42529]
  20. What does the system of binomial nomenclature that assigns a unique name to each organism describe?

    [Question ID = 10634]

    1. Family and species [Option ID - 42530]
    2. --- Content provided by‌ FirstRanker.com ---

    3. Genus and family [Option ID - 42531]
    4. Order and family [Option ID - 42532]
    5. Species and genus [Option ID - 42533]

    Correct Answer :-

    • Species and genus [Option ID - 42533]
    • --- Content provided by FirstRanker.com ---

  21. Wings of birds and insects have the same function but they do not share the same evolutionary origin. Bird and insect wings are considered to be which of the following?

    [Question ID = 10635]

    1. Analogous [Option ID - 42534]
    2. Homologous [Option ID - 42535]
    3. --- Content provided by​ FirstRanker.com ---

    4. Phylogenetic [Option ID - 42536]
    5. Taxonomic [Option ID - 42537]

    Correct Answer:-

    • Analogous [Option ID - 42534]
  22. --- Content provided by⁠ FirstRanker.com ---

  23. Which of the following animal phyla is most likely to leave fossils?

    [Question ID = 10636]

    1. Annelida [Option ID - 42538]
    2. Cnidaria [Option ID - 42539]
    3. Chordata [Option ID - 42540]
    4. --- Content provided by‍ FirstRanker.com ---

    5. Nematoda [Option ID - 42541]

    Correct Answer:-

    • Chordata [Option ID - 42540]
  24. Which of the following systems is active under stress?

    --- Content provided by​ FirstRanker.com ---

    [Question ID = 10637]

    1. Complete autonomic nervous system [Option ID - 42542]
    2. Parasympathetic nervous system [Option ID - 42543]
    3. Sympathetic nervous system [Option ID - 42544]
    4. Somatic nervous system [Option ID - 42545]
    5. --- Content provided by FirstRanker.com ---

    Correct Answer :-

    • Sympathetic nervous system [Option ID - 42544]
  25. Migration of fish from fresh water to marine water is known as:

    [Question ID = 10638]

    --- Content provided by⁠ FirstRanker.com ---

    1. Anadromous [Option ID - 42546]
    2. Catadromous [Option ID - 42547]
    3. Amphidromous [Option ID - 42548]
    4. Potamodromous [Option ID 42549]

    Correct Answer:-

    --- Content provided by⁠ FirstRanker.com ---

    • Catadromous [Option ID - 42548]
  26. How does pupa survive through its life cycle?

    [Question ID = 10639]

    1. Caudal flaps [Option ID - 42550]
    2. --- Content provided by FirstRanker.com ---

    3. Feeding through the water [Option ID - 42551]
    4. Feeding through the proboscis [Option ID - 42552]
    5. Through food accumulated in the larval stage [Option ID - 42553]

    Correct Answer :-

    • Through food accumulated in the larval stage [Option ID - 42553]
    • --- Content provided by FirstRanker.com ---

  27. Melatonin is synthesized from which of the following?

    [Question ID = 10640]

    1. Histamine [Option ID - 42554]
    2. Melanine [Option ID - 42555]
    3. --- Content provided by​ FirstRanker.com ---

    4. Tyrosine [Option ID - 42556]
    5. Tryptophan [Option ID - 42557]

    Correct Answer :-

    • Tryptophan [Option ID - 42557]
  28. --- Content provided by​ FirstRanker.com ---

  29. The slogan 'Taking Action for living planet' was used by:

    [Question ID = 10641]

    1. UNESCO [Option ID - 42558]
    2. United Nations Environment Programme [Option ID - 42559]
    3. World bank [Option ID - 42560]
    4. --- Content provided by‌ FirstRanker.com ---

    5. World Wide Fund for Nature [Option ID - 42561]

    Correct Answer :-

    • World Wide Fund for Nature [Option ID - 42561]
  30. The Guinness Book of World Records has declared ________ as the largest river island in the world.

    --- Content provided by‌ FirstRanker.com ---

    [Question ID = 10642]

    1. Bananal [Option ID - 42562]
    2. Marajo [Option ID - 42563]
    3. Majuli [Option ID - 42564]
    4. Nongkhnum [Option ID - 42565]
    5. --- Content provided by​ FirstRanker.com ---

    Correct Answer :-

    • Majuli [Option ID - 42564]
  31. In an experiment, we manipulate a/an ________ variable to observe an effect on a/an ________ variable.

    [Question ID = 10643]

    --- Content provided by⁠ FirstRanker.com ---

    1. dependent, another dependent [Option ID - 42566]
    2. dependent, independent [Option ID - 42567]
    3. independent, another independent (Option ID - 42568]
    4. independent, dependent [Option ID - 42569]

    Correct Answer :-

    --- Content provided by FirstRanker.com ---

    • independent, dependent [Option ID - 42569]
  32. Rooted plants are found only in the ________ zone of a lake.

    [Question ID = 10644]

    1. limnetic [Option ID - 42570]
    2. --- Content provided by FirstRanker.com ---

    3. littoral [Option ID - 42571]
    4. nektonic [Option ID - 42572]
    5. pelagic [Option ID - 42573]

    Correct Answer :-

    • littoral [Option ID - 42571]
    • --- Content provided by​ FirstRanker.com ---

  33. [Question ID = 10645]

    1. Everything affects everything else [Option ID - 42574]
    2. Humans have only one environment [Option ID - 42575]
    3. The environment is a closed system [Option ID - 42576]
    4. --- Content provided by FirstRanker.com ---

    5. All of these [Option ID - 42577]

    Correct Answer :-

    • Everything affects everything else [Option ID - 42574]
  34. Exponential growth is characterized by which of the following?

    --- Content provided by‌ FirstRanker.com ---

    [Question ID = 10646]

    1. 1) Growth at a constant rate [Option ID - 42578]
    2. 2) Growth at constant N [Option ID - 42579]
    3. 3) Both (1) and (2) [Option ID - 42580]
    4. 4) None of these [Option ID - 42581]
    5. --- Content provided by​ FirstRanker.com ---

    Correct Answer :-

    • 1) Growth at a constant rate [Option ID - 42578]
  35. In terms of a population, what does "age structure" refer to?

    [Question ID = 10647]

    --- Content provided by​ FirstRanker.com ---

    1. Per capita production of goods and services by age [Option ID - 42582]
    2. The proportion of the population in different age groups [Option ID - 42583]
    3. The rate of population growth [Option ID - 42584]
    4. All of these [Option ID - 42585]

    Correct Answer :-

    --- Content provided by⁠ FirstRanker.com ---

    • The proportion of the population in different age groups [Option ID - 42583]
  36. The processes responsible for formation and change of Earth's materials are collectively known as the:

    [Question ID = 10648]

    1. Atmospheric cycle [Option ID - 42586]
    2. --- Content provided by​ FirstRanker.com ---

    3. Continental cycle [Option ID - 42587]
    4. Geologic cycle [Option ID - 42588]
    5. Hydrologic cycle [Option ID - 42589]

    Correct Answer :-

    • Geologic cycle [Option ID - 42588]
    • --- Content provided by‍ FirstRanker.com ---

  37. In the context of biochemical cycles, what does "flux" refer to?

    [Question ID = 10649]

    1. A state of disturbance from natural conditions [Option ID - 42590]
    2. Loss of matter or energy from the Earth system [Option ID - 42591]
    3. --- Content provided by FirstRanker.com ---

    4. The loss of water vapour through the pores of plants [Option ID - 42592]
    5. The transfer of material or energy from one reservoir to another [Option ID - 42593]

    Correct Answer :-

    • The transfer of material or energy from one reservoir to another [Option ID - 42593]
  38. --- Content provided by FirstRanker.com ---

  39. Which short-term cycle affects carbon dioxide and oxygen, and which long-term cycle affects carbon dioxide and oxygen?

    [Question ID = 10650]

    1. Carbonate-silicate cycle [Option ID - 42594]
    2. Carbon-phosphate cycle [Option ID - 42595]
    3. Carbon-silicate cycle [Option ID - 42596]
    4. --- Content provided by​ FirstRanker.com ---

    5. Carbon-sulphate cycle [Option ID - 42597]

    Correct Answer :-

    • Carbonate-silicate cycle [Option ID - 42594]
  40. What are the two fundamental processes that must be studied to understand ecosystem structure and functioning?

    --- Content provided by‌ FirstRanker.com ---

    [Question ID = 10651]

    1. Flow of energy and cycling of chemical elements [Option ID - 42598]
    2. Photosynthesis and respiration [Option ID - 42599]
    3. Waste decomposition and cycling of energy [Option ID - 42600]
    4. All of these [Option ID - 42601]
    5. --- Content provided by​ FirstRanker.com ---

    Correct Answer :-

    • Flow of energy and cycling of chemical elements [Option ID - 42598]
  41. What are the species that are most abundant or otherwise most important in an ecological community called?

    [Question ID = 10652]

    --- Content provided by⁠ FirstRanker.com ---

    1. Common [Option ID - 42602]
    2. Dominant [Option ID - 42603]
    3. Pioneer [Option ID - 42604]
    4. Predominant [Option ID - 42605]

    Correct Answer :-

    --- Content provided by‍ FirstRanker.com ---

    • Dominant [Option ID - 42603]
  42. Which of the following processes lead to biological evolution?

    [Question ID = 10653]

    1. Migration and genetic drift [Option ID - 42606]
    2. --- Content provided by​ FirstRanker.com ---

    3. Mutation [Option ID - 42607]
    4. Natural selection [Option ID - 42608]
    5. All of these [Option ID - 42609]

    Correct Answer :-

    • All of these [Option ID - 42609]
    • --- Content provided by​ FirstRanker.com ---

  43. What are the dominant plants in a fresh water biome called?

    [Question ID = 10654]

    1. Eichhornia sp. [Option ID - 42610]
    2. Phytoplankton [Option ID - 42611]
    3. --- Content provided by‌ FirstRanker.com ---

    4. Spirogryra [Option ID - 42612]
    5. Vallisneria sp. [Option ID - 42613]

    Correct Answer :-

    • Vallisneria sp. [Option ID - 42613]
  44. --- Content provided by‌ FirstRanker.com ---

  45. In general what percentage of energy received by green plants from the sun is converted into new plant tissues?

    [Question ID = 10655]

    1. less than 5 [Option ID - 42614]
    2. less than 10 [Option ID - 42615]
    3. less than 15 [Option ID - 42616]
    4. --- Content provided by​ FirstRanker.com ---

    5. less than 25 [Option ID - 42617]

    Correct Answer :-

    • less than 5 [Option ID - 42614]
  46. What are the main components of Integrated Pest Management (IPM)?

    --- Content provided by‍ FirstRanker.com ---

    [Question ID = 10656]

    1. Biological control [Option ID - 42618]
    2. Land culture [Option ID - 42619]
    3. Chemical control [Option ID - 42620]
    4. All of these [Option ID - 42621]
    5. --- Content provided by FirstRanker.com ---

    Correct Answer :-

    • All of these [Option ID - 42621]
  47. The dose of a toxin at which a specified percentage of test population dies is known as:

    [Question ID = 10657]

    --- Content provided by​ FirstRanker.com ---

    1. control [Option ID - 42622]
    2. lethal dose [Option ID - 42623]
    3. placebo dose [Option ID - 42624]
    4. toxic dose [Option ID - 42625]

    Correct Answer :-

    --- Content provided by‍ FirstRanker.com ---

    • lethal dose [Option ID - 42623]
  48. Why is natural gas considered a better fossil fuel than oil?

    [Question ID = 10658]

    1. Burning natural gas is cleaner than burning oil [Option ID - 42626]
    2. --- Content provided by FirstRanker.com ---

    3. Gas commands a higher price than oil [Option ID - 42627]
    4. Gas is easier to transport [Option ID - 42628]
    5. Gas is a renewable resource [Option ID - 42629]

    Correct Answer :-

    • Burning natural gas is cleaner than burning oil [Option ID - 42626]
    • --- Content provided by​ FirstRanker.com ---

  49. Direct conversion of electricity using sunlight without an intermediate fluid medium is accomplished by which of the following?

    [Question ID = 10659]

    1. Li-ion battery [Option ID - 42630]
    2. Photochemical cell [Option ID - 42631]
    3. --- Content provided by FirstRanker.com ---

    4. Photovoltaic cell [Option ID - 42632]
    5. All of these [Option ID - 42633]

    Correct Answer :-

    • Photovoltaic cell [Option ID - 42632]
  50. --- Content provided by FirstRanker.com ---

  51. Long-term plans expect to finish the clean-up work at Chernobyl by which of the following year?

    [Question ID = 10660]

    1. 2016 [Option ID - 42634]
    2. 2026 [Option ID - 42635]
    3. 2036 [Option ID - 42636]
    4. --- Content provided by‍ FirstRanker.com ---

    5. 2065 [Option ID - 42637]

    Correct Answer :-

    • 2065 [Option ID - 42637]
  52. What is saltwater intrusion?

    --- Content provided by FirstRanker.com ---

    [Question ID = 10661]

    1. Excessive withdrawal of groundwater [Option ID - 42638]
    2. Invasion of saltwater into freshwater supplies [Option ID - 42639]
    3. Natural outflow of water from a natural spring [Option ID - 42640]
    4. All of these [Option ID - 42641]
    5. --- Content provided by⁠ FirstRanker.com ---

    Correct Answer :-

    • Invasion of saltwater into freshwater supplies [Option ID - 42639]
  53. Which of the following compounds absorb earthshine in the wavelengths that typically pass through the atmospheric window?

    [Question ID = 10662]

    --- Content provided by​ FirstRanker.com ---

    1. Carbon dioxide [Option ID - 42642]
    2. Chloroflourocarbons [Option ID - 42643]
    3. Ozone [Option ID - 42644]
    4. Water vapour [Option ID - 42645]

    Correct Answer:-

    --- Content provided by​ FirstRanker.com ---

    • Chloroflourocarbons [Option ID - 42643]
  54. About what percentage of the solar energy is reflected back by ice?

    [Question ID = 10663]

    1. 10-25% [Option ID - 42646]
    2. --- Content provided by FirstRanker.com ---

    3. 30-45% [Option ID - 42647]
    4. 60-75% [Option ID - 42648]
    5. 80-95% [Option ID - 42649]

    Correct Answer :-

    • 80-95% [Option ID - 42649]
    • --- Content provided by‍ FirstRanker.com ---

  55. Sulphur dioxide emissions are predominantly caused by which of the following?

    [Question ID = 10664]

    1. 1) Burning coal [Option ID - 42650]
    2. 2) Automobile emissions [Option ID - 42651]
    3. --- Content provided by FirstRanker.com ---

    4. 3) Both (1) and (2) [Option ID - 42652]
    5. 4) Photochemical smog [Option ID - 42653]

    Correct Answer :-

    • 3) Both (1) and (2) [Option ID - 42652]
  56. --- Content provided by FirstRanker.com ---


  57. This download link is referred from the post: DUET Last 10 Years 2011-2021 Question Papers With Answer Key || Delhi University Entrance Test conducted by the NTA

--- Content provided by⁠ FirstRanker.com ---