Little leaf of brinjal is caused by

What is the function of heterocysts?

Cyanobacteria are also known as ....

Which among the following are the smallest living cells,known without a definite cell wall,pathogenic to plants as well as animals and can survive without oxygen?

Which organisms obtain energy from the oxidation of reduced inorganic compounds?

$Vibrio$ $cholerae$ is a motile bacterium belonging to which group based on flagellar arrangement?