Question

Where do certain symbiotic microorganisms normally occur in the alimentary canal of the human body?

• A. Caecum
• B. Tongue
• C. Ileum
• D. Duodenum

Answer 1

The correct option is A Caecum

A relationship between two organisms in which both of them benefit from each other is called a symbiotic relationship.

Microbes are considered harmful since they cause diseases, but certain microbes in our body are also beneficial to us. In the alimentary canal the symbiotic association with the beneficial microbes is seen in caecum.

Caecum is a pouch like structure and it is a part of the large intestine. Some of these microbes in the caecum are capable of producing vitamins in minor quantities like vitamin K and vitamin B complex.

The muscular structure present in the oral cavity that helps in sensing the taste and mixing of masticated food is called tongue. The microbes present in the lining of the tongue are generally harmful to us.

The C-shaped structure of the small intestine is called duodenum and the highly coiled portion of the small intestine is called the ileum. Both these structures do not have any symbiotic association with the microbes.