Question

Draw a well-labelled diagram of Nostoc.

Answer 1

Answer:

here is ur diagram

Answer 2

*PLEASE REFER TO THE PICTURE FOR THE DIAGRAM.

• Nostoc is a type of Gram-negative, photosynthetic cyanobacteria.
• This bacteria can be found in both terrestrial as well as the aquatic environment.
• In various species of Nostoc, there is an outer layer and an inner matrix of polysaccharides.
• The cells are spherical, oval, or cylindrical in shape.
• The differentiated cells in the filament are known as heterocysts, which are the sites of nitrogen fixation.
• The filament is covered by a protective mucilaginous sheath.
• Extracellular pigments such as nostocine, and scytonemin are also present that protect the body from UV rays.
• Other pigments are chlorophyll (green pigment). Phycocyanin (blue) and phycoerythrin (red).

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