Assertion : Rumen of alimentary canal of ruminant animals harbour numerous bacteria and protozoa.
Reason : Bacteria and protozoa help in the secretion of gastric juice in the rumen.
Ruminant animals such as cattle, buffalo, sheep, goat and camel have a compound stomach, which consists of four chamber, viz, rumen, reticulum, omasum and abomasum. Rumen is the first and the largest of the four chambers. Rumen and reticulum harbour numerous bacteria and protozoa, which carry out extensive fermentation of cellulose. So, these two chambers function as sites for cellulose digestion in ruminantts. The gastric juice containing enzymes and HCl is secreted only by the fourth chamber i.e., Abomasum.