Q. 36 What is the group of bacteria found in both the rumen of cattle and sludge of sewage treatment?

Mothanogans (Methanebacrerim), anaambically braeak  down cellulosic material to produce CO2and H2 and are found in 

 (i)Anaerobic sludge in sewage lreatinent plants

(ii) Rumen (a part of stomach) of cates, thus providing nuilion to cates.