Bacteria can be classified by shape. For the following bacteria species, give their basic bacterial shape.
Streptococcus pyogenes: Paenibacillus polymyxa: Aquaspirillum bengal:

Streptococcus pyrogenes : Round (or) Ovoid

Paenibaccilus polymyxa:

Aquaspirillum bengal: Helical

Explanation:

Streptococcus pyogenes are gram positive, Round shaped, Anaerobic growth bacteria, Non-motile bacteria.Aquaspirillum bengal is helical  in shape with  its composition of  deoxyribonucleic acid  and cytosine. It is Gram negative and chemo-organotrophic. It is also motile with the help of flagella.Paenibacillus polymyxa is also known as Bacillus polymyxa which is  capable of fixing nitrogen. It is found in soil, plant tissues and marine sediments. It has a major role in forest ecosystems and potential future applications as a biofertilizer and biocontrol agent in agriculture.

It allows water to resist freezing and thawing cycle.