The outermost layer of alimentary canal is called –

Correct option is A

The correct answer is (a) Serosa
Explanation:
. The alimentary canal consists of four layers from inside to outside: mucosa, submucosa, muscularis externa, and serosa.
. Serosa is the outermost layer and is a thin membranous covering.
. It is derived from the visceral peritoneum.
. Serosa provides protection and reduces friction between abdominal organs.
. NCERT Class 11 Biology describes serosa/adventitia as the outermost covering.
Information Booster:
. In retroperitoneal organs, serosa is replaced by adventitia.
. Proper functioning of layers ensures digestion, absorption, and movement of food.
Additional Knowledge:
Muscularis (Option b)
. Also called muscularis externa.
. Responsible for peristalsis and movement of food.
Mucosa (Option c)
. Innermost layer of the alimentary canal.
. Involved in secretion, digestion, and absorption.
Lumen (Option d)
. Central hollow cavity of the alimentary canal.
. Not a structural layer.