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3201
The bacteria that reduce nitrates in the soil into gaseous nitrogen are referred to as
  • A. nitrifying bacteria
  • B. denitrifying bacteria
  • C. putrefying bacteria
  • D. saprophytic bacteria
View Answer & Discuss (3) WAEC 2013
3202
A pyramid of numbers is constructed by
  • A. comparing living and non-living things
  • B. measuring productivity
  • C. conducting census
  • D. labelling the living organisms
View Answer & Discuss (2) WAEC 2013
3203
The main reason for immunizing children is to
  • A. destroy pathogens in their bodies
  • B. increase the production of white blood cells
  • C. stimulate the production of antibodies
  • D. simulate the production of antigens
View Answer & Discuss WAEC 2013
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3204
Rhizobium which lives in the root nodules of leguminous plants is an example of the association known as
  • A. commensalism
  • B. epiphytism
  • C. mutualism
  • D. saprophytism
View Answer & Discuss WAEC 2013
3205

Ascaris lumbricoides is a parasitic

  • A. flat worm
  • B. round worm
  • C. arthropod
  • D. elastic worm
View Answer & Discuss (2) WAEC 2013
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