Question

Draw an alimentary canal of cockroach. Label any six parts.

Answer 1

Hint:The digestion of food would take place in the cavity specialized, or combined together. Alimentary canal is also called digestive tract and it is the pathway by which the food enters the body and solid waste goes out from the body.

Complete answer:

Digestion is defined as the process in which breakdown of food takes place into smaller components. Parts of the alimentary canal of cockroach have been divided into 3 sections:- fore-gut, mid-gut, hind-gut.
1) Salivary glands:-The salivary glands of cockroach acini with ion transporting cells. It has a duct system with a pair of reservoirs. There are 2 salivary ducts that join into a common duct. 2) Gizzard:- The gizzard is a muscular stomach. It has a sharp tooth like structure that helps in grinding the food into minute pieces. 3) Crop:- Food moves to the esophagus and then into the crop.
4)Malpighian tubules: It is the excretory organ of the cockroach. It is mainly found between midgut and hindgut. It helps in removing the excretory waste from the haemolymph. Hepatic caeca: It is the ring of mainly 8 blind tubules. The function of hepatic caeca is that they help to secrete digestive juices to facilitate digestion. It is present at the junction of the fore-gut and the midgut. 5)Ileum: -It is a small, narrow, tabular part. It helps in absorbing the remaining nutrients which were not absorbed by the crop. It helps in neutralizing all the nutrients from the food contents. Colon:- it is a highly coiled structure. It is considered to be an important site. For symbiotic digestion. It has the highest diversity and density of bacteria of all the gut compartment.

Note: Cockroach is omnivorous. The nutrition in cockroaches is holozoic. It can eat all kinds of organic matter. Cockroaches can live 8 days without their head. Digestion of food takes place via an alimentary canal and waste food goes out of the body.