11th Class Biology MCQs with Answers download pdf Chapter No.1 Introduction

37. Evolution increases:

  • popdations
  • organisms
  • biodiversity
  • none

Answer:
biodiversity




38. Propagation of transgenic plants is possible by

  • cloning
  • hydroponics
  • selection
  • all of these

Answer:
cloning

39. An aphid that attacks walput tree is being controlled by:

  • wasp
  • drosophila
  • mosquito
  • bacteria

Answer:
wasp

40. Algae have been found to reduce pollution of heavy metals by :

  • bioabsorption
  • biological control
  • biomagnification
  • all of these

Answer:
bioabsorption




41. Lead free petrol is necessary to reduce the :

  • pollution
  • CO
  • SO2
  • CO2

Answer:
pollution

42. Number of naturally occurring elements are:

  • 90
  • 92
  • 94
  • 96

Answer:
92

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