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Need clarity, kindly explain! Besides paddy fields cyanobacteria are also found inside vegetative part of:

Besides paddy fields cyanobacteria are also found inside vegetative part of:

  • Option 1)

    Cycas 

  • Option 2)

    Equisetum 

  • Option 3)

    Psilotum 

  • Option 4)

    pinus 

 
Answers (1)
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V Vakul

 

Plant body of Gymnosperms -

Differentiated into root, stem and leaves.

- wherein

Root: Coralloid roots of cycas is associated with N2 fixing blue green algae.Pinus is associated with endophytic fungi called mycorrhizae.

Stem: Mostly erect, aerial, solid and cylindrical. Cycas root is unbranched. Pinus, Cedrus and conifers root is branched.

 

 

Cyano bacteria / Blue green algae -

  • Gram negative, photosynthetic, prokaryotes.
  • Contain chlorophyll – a, carotene, phycobilin.
  • Cell membrane lacks sterol.
  • Reserve food material is cyanophycin protein, Cyanophycean starch, lipid globules.
  • Non flagellate, moment by gliding motion,
  • Some of them can fix atmospheric nitrogen in heterocysts.

Eg. Nostoc and anabaena,

- wherein

Eg. Trichodesmium erythreum, Nostoc commune.

 

 


Option 1)

Cycas 

This is correct option

Option 2)

Equisetum 

This is incorrect option

Option 3)

Psilotum 

This is incorrect option

Option 4)

pinus 

This is incorrect option

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