Specialized cells for fixing atmospheric nitrogen in $Nostoc$ are

  • A
    heterocysts
  • B
    hormogonia
  • C
    nodules
  • D
    akinetes

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$Clostridium$ is an example of:

How many categories are bacteria divided into based on their shape?

Bacteria are grouped into four categories based on their shape. Study the given figure and identify $P, Q, R,$ and $S$.

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$A$ single filament of $Nostoc$ without the mucilage sheath is known as:

When a bacterium is provided with flagella arising from two opposite ends,it is called

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