Ecosystem PYQs Set 2 (PDF)

Set 2 of 8 · Questions 31-60 of 211

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Mere Teacher · Previous Year Questions NEET Biology · Ecosystem · Set 2 (Q31-60)
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31. $The mass of living material at a trophic level at a particular time is called :$ (1) $Standing state$ (2) $Net primary productivity$ (3) $Standing crop$ (4) $Gross primary productivity$ 32. $Which one of the following is not used for ex situ plant conservation?$ (1) $Botanical Gardens$ (2) $Field gene banks$ (3) $Seed banks$ (4) $Shifting cultivation$ 33. $The two gases making highest relative contribution to the greenhouse gases are :$ (1) $C O_{2} and N_{2} O$ (2) $C O_{2} and C H_{4}$ (3) $C H_{4} and N_{2} O$ (4) $C F C_{5} and N_{2} O$ 34. $The species confined to a particular region and not found elsewhere is termed as :$ (1) $Rare$ (2) $Keystone$ (3) $Alien$ (4) $Endemic$ 35. $Detritivores breakdown detritus into smaller particles. This process is called :$ (1) $Fragmentation$ (2) $Humification$ (3) $Decomposition$ (4) $Catabolism$ 36. $Montreal Protocol which calls for appropriate action to protect the ozone layer from human activities was passed in the year$ (1) $1988$ (2) $1985$ (3) $1986$ (4) $1987$ 37. $Western Ghats have a large number of plants and animal species that are not found any where else. Which of the following term is used to notify such species?$ (1) $Threatened species$ (2) $Keystone species$ (3) $Endemic species$ (4) $Vulnerable species$ 38. $Which of the following is an innovative remedy for plastic waste?$ (1) $Burning in the absence of oxygen$ (2) $Burrying 500 m deep below soil surface$ (3) $Polyblend$ (4) $Electrostatic precipitator$ 39. $Which the following are most suitable indicators of S O_{2} pollution in the environment?$ (1) $Fungi$ (2) $Lichens$ (3) $Conifers$ (4) $Algae$ 40. $Which of the following statements about ozone is correct?$ (1) $Tropospheric ozone protects us from UV radiations.$ (2) $Stratospheric ozone is 'bad'$ (3) $Tropospheric ozone is 'good'$ (4) $Stratospheric ozone protects us from UV radiations$ 41. $A high density of elephant population in an area can result in :-$ (1) $Predation on one another$ (2) $Mutualism$ (3) $Intra specific competition$ (4) $Inter specific competition$ 42. $Which of the following is put into Anaerobic sludge digester for further sewage treatment?$ (1) $Activated sludge$ (2) $Primary sludge$ (3) $Floating debris$ (4) $Effluents of primary treatment$ 43. $The entire fleet of buses in Delhi were converted to CNG from diesel. In reference to this, which one of the following statements is false?$ (1) $The same diesel engine is used in CNG buses making the cost of conversion low$ (2) $It is cheaper than diesel$ (3) $It can not be adulterated like diesel$ (4) $CNG burns more efficiently than diesel$ 44. $High value of BOD (Biochemical Oxygen Demand) indicates that :-$ (1) $Water is highly polluted$ (2) $Water is less polluted$ (3) $Consumption of organic matter in the water is higher by the microbes$ (4) $Water is pure$ 45. $Vertical distribution of different species occupying different levels in a biotic community is known as:$ (1) $Stratification$ (2) $Zonation$ (3) $Pyramid$ (4) $Divergence$ 46. $Rachel Carson's famous book "Silent Spring" is related to :-$ (1) $Noise pollution$ (2) $Population explosion$ (3) $Ecosystem management$ (4) $Pesticide pollution$ 47. $Decline in the population of indian native fishes due to introduction of Clarias gariepinus in river Yamuna can be categoriesd as:-$ (1) $Co-extinction$ (2) $Habitat fragmentation$ (3) $Over exploitation$ (4) $Alien species invasion$ 48. $In a coal fired power plant electrostatic precipitators are installed to control emission of:-$ (1) $CO$ (2) $S O_{2}$ (3) $NOX$ (4) $SPM$ 49. $A system of rotating crops with legume or grass pasture to improve soil structure and fertility is called:-$ (1) $Ley farming$ (2) $Contour farming$ (3) $Strip farming$ (4) $Shifting agriculture$ 50. $Which one of the following is a xerophytic plant in which the stem is modified into a flat, green and succulent structure?$ (1) $Casuarina$ (2) $Hydrilla$ (3) $Acacia$ (4) $Opuntia$ 51. $Most of the animals that live in deep oceanic waters are$ (1) $Secondary consumers$ (2) $Tertiary consumers$ (3) $Detritivore$ (4) $Primary consumers$ 52. $Which of the following is a secondary pollutant?$ (1) $CO$ (2) $C O_{2}$ (3) $S O_{2}$ (4) $O_{3}$ 53. $The species that come to appear in bare area are called :$ (1) $Pioneer species$ (2) $Invasive species$ (3) $Competitive species$ (4) $Species of seral community$ 54. $Which of the following is the most important cause of animals and plants being driven to extinction?$ (1) $Over - exploitation$ (2) $Alien species invasion$ (3) $Habitat loss and fragmentation$ (4) $Co-extinctions$ 55. $In gobar gas, the maximum amount is that of :-$ (1) $Propane$ (2) $Carbon dioxide$ (3) $Butane$ (4) $Methane$ 56. $Measuring Biochemical Oxygen Demand (BOD) is a method used for :$ (1) $Measuring the activity of Saccharomyces cerevisae in producing curd on a commercial scale.$ (2) $Working out the efficiency of R.B.Cs. about their capacity to carry oxygen.$ (3) $Estimating the amount of organic matter in sawage water.$ (4) $Working out the efficiency of oil driven automobile engines.$ 57. $The correct sequence of plants in a hydrosere is :-$ (1) $Oak \to Lantana \to Volvox \to Hydrilla \to Pistia \to Scirpus$ (2) $Oak \to Lantana \to Scirpus \to Pistia \to Hydrilla \to Volvox$ (3) $Volvox \to Hydrilla \to Pistia \to Scirpus \to Lantana \to Oak$ (4) $Pistia \to Volvox \to Scirpus \to Hydrilla \to Oak \to Lantana$ 58. $A location with luxuriant growth of lichens on the trees indicates that the :-$ (1) $Trees are very healthy$ (2) $Trees are heavily infested$ (3) $Location is highly polluted$ (4) $Location is not polluted$ 59. $Frugivorous birds are found in large numbers in tropical forests mainly because of :$ (1) $lack of niche specialization$ (2) $higher annual rainfall$ (3) $availability of fruits throughout the year$ (4) $temperature conducive for their breeding$ 60. $The UN Conference of Parties on climate change in the year 2011 was held in :-$ (1) $South Africa$ (2) $Peru$ (3) $Qatar$ (4) $Poland$