Ecology & Ecosystems PYQs

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1. Prelims 2011Q22Ecology & Ecosystems

   In the context of ecosystem productivity, marine upwelling zones are important as they increase the marine productivity by bringing the

   1.Decomposer microorganisms to the surface,

   2.Nutrients to the surface,

   3.Bottom-dwelling organisms to the surface.

   Which of the statements given above is/are correct?

   a1 and 2b2 onlyc2 and 3d3 only
2. Prelims 2011Q23Ecology & Ecosystems

   If a tropical rain forest is removed, it does not regenerate quickly as compared to a tropical deciduous forest. This is because

   athe soil of rain forest is deficient in nutrientsbpropagules of the trees in a rain forest have poor viabilitycthe rain forest species are slow-growingdexotic species invade the fertile soil of rain forest
3. Prelims 2011Q48Ecology & Ecosystems

   Consider the following :

   1.Photosynthesis

   2.Respiration

   3.Decay of organic matter

   4.Volcanic action

   Which of the above add carbon dioxide to the carbon cycle on Earth ?

   a1 and 4 onlyb2 and 3 onlyc2, 3 and 4 onlyd1, 2, 3 and 4
4. Prelims 2011Q76Ecology & Ecosystems

   The 2004 Tsunami made people realize that mangroves can serve as a reliable safety hedge against coastal calamities. How do mangroves function as a safety hedge?

   aThe mangrove swamps separate the human settlements from the sea by a wide zone in which people neither live nor venture outbThe mangroves provide both food and medicines which people are in need of after any natural disastercThe mangrove trees are tall with dense canopies and serve as an excellent shelter during a cyclone or tsunamidThe mangrove trees do not get uprooted by storms and tides because of their extensive roots
5. Prelims 2010Q23Ecology & Ecosystems

   A pesticide which is a chlorinated hydrocarbon is sprayed on a food crop. The food chain is:

   Food crop – Rat – Snake – Hawk. In this food chain, the highest concentration of the pesticide would accumulate in which one of the following?

   aFood cropbRatcSnakedHawk
6. Prelims 2003Q110Ecology & Ecosystems

   Assertion (A): Unlike temperate forests, the tropical rain forests, if cleared, can yield productive farm-land that can support intensive agriculture for several years even without chemical fertilizers.

   Reason (R): The primary productivity of the tropical rain forest is very high when compared to that of the temperate forests.

   aBoth A and R are individually true and R is the correct explanation of AbBoth A and R are individually true but R is NOT the correct explanation of AcA is true but R is falsedA is false but R is true
7. Prelims 2001Q127Ecology & Ecosystems

   Epiphytes are plants which depend on other plants for

   afoodbmechanical supportcshadedwater
8. Prelims 2000Q126Ecology & Ecosystems

   Within biological communities, some species are important in determining the ability of a large number of other species to persist in the community. Such species are called

   aKeystone speciesbAllopatric speciescSympatric speciesdThreatened species
9. Prelims 1998Q22Ecology & EcosystemsAnswer disputed

   Indonesian forest fire in 1997 was caused by

   agreenhouse effectbdepletion of the ozone layercEl Niño effectsdNone of the above
10. Prelims 1998Q54Ecology & Ecosystems

    Estuaries possess distinct blooms of excessive growth of a pigmented dinoflagellate. These blooms are called

    ared tidesbsea tidescblack tidesdsea flowers
11. Prelims 1997Q120Ecology & Ecosystems

    Which one of the following organisms is likely to show the highest concentration of DDT once it has been introduced into the ecosystem?

    aGrasshopperbToadcSnakedCattle
12. Prelims 1996Q49Ecology & Ecosystems

    Assertion (A): Mangroves are very specialised forest ecosystems of tropical and subtropical regions bordering certain sea coasts.

    Reason (R): They stabilise the shoreline and act as bulwark against encroachments by sea.

    In the context of the above two statements, which one of the following is correct?

    aBoth A and R are true and R is the correct explanation of AbBoth A and R are true but R is not a correct explanation of AcA is true but R is falsedA is false but R is true
13. Prelims 1995Q32Ecology & Ecosystems

    “Monoculture of commercially viable trees is destroying the unique natural profile of ……… Thoughtless exploitation of timber, deforesting vast tracts for palm cultivation, destruction of mangroves, illegal logging by tribals and poaching only compound the problem. Fresh water pockets are fast drying up due to deforestation and destruction of mangroves.” The place referred to in this quotation is

    aSundarbansbKerala CoastcOrissa CoastdAndaman and Nicobar Islands