Olympiad – Class VIII – Science - Bio - Microorganisms

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Question - 1

Which of the following is the smallest microorganisms?

  • A Algae
  • B Bacterium
  • C Protozoan
  • D Virus

Question - 2

Identify W, X and Y

  • A W X Y Virus Protozoan Fungus
  • B W X Y Algae Bacterium Virus
  • C W X Y Virus Fungus Protozoan
  • D W X Y Fungus Algae Bacterium

Question - 3

Identify bacteriophage.

  • A Algae
  • B Virus
  • C Protozoa
  • D Fungi

Question - 4

Which of the following statements describes bacteriophage correctly?

  • A It is a bacterium which causes diseases in plants.
  • B It is a type of virus which attacks bacteria.
  • C It is a bacterium which kills viruses.
  • D It can multiply inside both living and non-living cells.

Question - 5

Fungi reproduces by

  • A Fission
  • B Fusion
  • C Seed formation
  • D Spore formation

Question - 6

Which of the following characteristics places algae in the group of autotroph?

  • A Carrying out anaerobic respiration
  • B Manufacturing their own food
  • C Feeding on dead organisms
  • D Feeding on other living organisms

Question - 7

The moist bread becomes mouldy after a few days when it is left in a container with a cover. Which of the following conditions favour the growth of the fungus?

  • A Absence of light
  • B Absence of water
  • C Presence of sunlight
  • D Presence of carbon dioxide

Question - 8

Which of the following microorganisms play an important role in maintaining the balance of nitrogen gas in the atmosphere?

  • A Viruses
  • B Bacteria
  • C Algae
  • D Protozoa

Question - 9

What causes the dough to rise when yeast is added to it?

  • A An increase in temperature
  • B An increase in the amount of substance
  • C An increase in the amount of released water by yeast cells
  • D The release of carbon dioxide gas

Question - 10

What process takes place when yeast is added to grape juice and left for a week?

  • A Decomposition
  • B Fermentation
  • C Distillation
  • D Oxidation