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 Multiple Choice QuestionsMultiple Choice Questions

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1.

Biotic factors are :

  • chemical factors of soil which affect life

  • physical factors of soil which affect life

  • all living organisms which influence other organisms

  • factors of atmosphere which affect life


2.

Which of the following would appear as the pioneer organisms on bare rocks?

  • Liverworts

  • Mosses

  • Green algae

  • Green algae

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3.

The term ecosystem was coined by

  • AG Tansley

  • E Haeckel

  • E Warrning

  • E Warrning

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4.

Secondary productivity is rate of formation of new organic matter by

  • producer

  • parasite

  • consumer

  • consumer

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5.

Natural reservoir of phosphorus is 

  • sea water

  • animal  bones

  • rock

  • rock

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6.

During  sewage treatment, biogas are produced, which include

  • methane, hydrogen sulphide and carbon dioxide

  • methane, oxygen and hydrogen sulphide

  • hydrogen sulphide, methane and sulphur dioxide

  • hydrogen sulphide, methane and sulphur dioxide

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7.

Which one of the following processes during decomposition is correctly described? 

  • Fragmentation - Carried out by organisms such as earthworm

  • Humification - Leads to the accumulation of a dark coloured substance humus, which undergoes microbial action at a very fast rate

  • Catabolism - Last step in the decomposition under fully anaerobic condition

  • Catabolism - Last step in the decomposition under fully anaerobic condition

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8.

Match the name of the animal (Column I ) with one characteristic (Column II) and the phylum/class (Column III ) to which it belongs

  • Column I

    Column II

    Column III

    a

    Petromyzon

    Ectoparasite

    Cyclostomata

  •  

    Column I

    Column II

    Column III

    b

    Lchthyophis

    Terrestrial

    Reptilla

  •  

    Column I

    Column II

    Column III

    c

    Limulus

    Body covered by chitinous exoskeleton

    Pisces

  •  

    Column I

    Column II

    Column III

    c

    Limulus

    Body covered by chitinous exoskeleton

    Pisces

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9.

In which of the following both pairs have correct combination?


  • Gaseous nutrient cycle Carbon and Nitrogen
    Sedimentary nutrient cycle Sulphur and Phosphorus

  • Gaseous nutrient cycle Carbon and Sulphur
    Sedimentary nutrient cycle Nitrogen and Phosphorus
  • Gaseous nutrient cycle Nitrogen and Sulphur
    Sedimentary nutrient cycle Carbon and Phosphorus

  • Gaseous nutrient cycle Nitrogen and Sulphur
    Sedimentary nutrient cycle Carbon and Phosphorus

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10.

During ecological succession

  • the gradual and predictable change in species composition occurs in a given area.

  • the establishment of a new biotic community is very fast in its primary phase.

  • the number and types of animals remain constant.

  • the number and types of animals remain constant.

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