Question

Salivary glands of cockroach open at
A) Buccal cavity
B) Hypopharynx
C) Epipharynx
D) Pharynx

Answer 1

Hint: The anterior part of the gut towards the mouth of a Cockroach is called the salivary gland which has a pair of salivary glands. Each salivary gland is branched. Secretions from all the branches are poured into a common duct. In a pair of salivary glands, there is a thin-walled salivary receptacle. It is just like a bladder. Which stores salivary secretions. Saliva contains amylase. This amylase converts starch into sugar.

Complete answer:
The correct option is (B). The salivary gland of cockroaches opens into hypopharynx. The salivary gland secretes saliva to lubricate the food material mainly.
A) The buccal cavity opens into a short pharynx. It is a small tube. The buccal cavity of cockroaches does not contain salivary glands.
B) Hypopharynx further leads to the oesophagus. Which leads to the digestive tract. The salivary gland opens at the base of the hypopharynx. Hence, it is the correct option.
C) Epipharynx does not have any role in the functions of the salivary gland. Hence, it is the wrong answer.
D) Pharynx is the empty space behind the hypopharynx which leads to oesophagus and trachea in different directions. Pharynx is not the correct answer.

Additional Information : The cockroaches belong to the phylum Arthropoda under the class Insecta which is the most evolved class among all the animals. They are omnivorous, hence their digestion process is quite complex.

Note: Salivary glands of cockroach appear as a group of small leaves. Parts of salivary glands – It contains a paired and group of several globules called Secretory acini. The salivary glands are closed to salivary receptacles. Salivary glands contain salivary ducts which are attached to the duct of the receptacle, from here this duct is called common salivary duct. This common salivary duct further attaches to the hypopharynx in the buccal cavity.