Question

Length of human alimentary canal is
A. 100 cm
B. 3-4 m
C. 4-6 m
D. 6-9 m

Answer 1

Hint: The alimentary canal is often referred to as a pathway through which the food enters the human body.

Complete Answer:
Digestion is the process by which food substances are broken down into smaller particles so that they can be easily absorbed by the body.
Alimentary canal: It is a tube - like structure which begins from the mouth and ends at the anus and has a very important role in digestion.

Option D: The waste products are then thrown out from the human body via the anus during digestion. The alimentary canal is a tubular structure starting from the mouth and ending up to the anus. This accomplishes a primary role in the digestion process and is commonly referred to as the digestive tract. Starting from the oesophagus and reaching up to the anus, the alimentary canal makes up to 30 feet or 9m long route. Therefore, this is the correct answer.
Option A, B and C are incorrect.

Thus, the correct option is D) 6-9m.

Note: The various organs involved in the alimentary canal are,
(I) Mouth and oral cavity - Food is ingested via the mouth.
(II) Oesophagus - It helps in passing the bolus from mouth to stomach.
(III) Stomach - It helps in digestion of food.
(IV) Small Intestine - It helps in absorption of food.
(V) Large intestine - It helps in absorption of electrolytes and waters and also helps in formation and propelling of feces towards the rectum for excretion.