Cyanobacteria do not possess which feature?

  1. Unicellular
  2. Colonial or filamentous
  3. Form blooms in polluted water bodies
  4. Only marine algae
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The specialised cells to fix atmospheric nitrogen is called as

  1. Heterocyst
  2. Heterocyte
  3. Heterocoem
  4. Heterolog
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Find the incorrect match.

  1. Heterocyst-Archaebacteria
  2. Gelatinous sheath- BGA
  3. Methanogen- Biogas
  4. Chlorella- protista
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Which of the following is correct with respect to heterocyst

  1. Nostoc, Anabena
  2. Only Anabena
  3. Nostoc
  4. All eubactetia
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Chemosynthetic autotrophic bacteria does not help in recycling of

  1. Nitrogen
  2. Iron
  3. Sulphur
  4. Mangnese 
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Chemosynthetic bacteria does not use which inorganic substrate?

  1. Nitrites
  2. Nitrates
  3. Chlorides
  4. Both a and b
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Chemosynthetic autotrophs derive energy by

  1. By sunlight
  2. By oxidation of inorganic substances
  3. By reduction of inorganic substances
  4. By reduction followed by oxidation of inorganic substances
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The majority of heterotrophic bacteria are

  1. Decomposers
  2. Autotrophs
  3. Lithotrophs
  4. Organotrophs
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Lactobacillus comes under which category

  1. Autotrophs
  2. Lithotrophs
  3. Organotrophs
  4. Heterotrophs
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Leguminous plants have bacteria with which kind of mode of nutrition-

  1. Heterotrophs
  2. Autotrophs
  3. Lithotrophs
  4. Organotrophs
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