Question

The egg case in female cockroach is formed by secretion of
A. Colleterial gland
B. Mushroom gland
C. Conglobate gland
D. Prothoracic gland

Answer 1

Hint: The egg case, also known as the ootheca the secretion of a gland over the fertilized eggs in the genital pouch of the female cockroach. The egg case is deposited in some warm dark sheltered place by the female cockroach using the ovipositor processes. The egg case is an oval-shaped structure containing sixteen fertilized eggs placed in two rows.

Complete answer:
Female cockroaches produce egg cases, known as ootheca. Ootheca contains 16 fertilized eggs which are enveloped by a proteinaceous secretion secreted by the colleterial gland that gradually hardens to form a strong, protective casing around the eggs. The Ootheca is made up of structural proteins and tanning agents that cause the protein to harden around the eggs, providing protection and stability. The production of ootheca is widely seen across numerous insect species for protection from parasites and other forms of predation. The Ootheca are most notably found in Cockroaches where it protects the eggs from microorganisms, parasitoids, predators, and weather conditions.

The ootheca is capable of maintaining a stable water balance through its surface. The surface of the ootheca is porous in dry climates, and smooth in wet climates to protect against desiccation and oversaturation respectively. The colleterial glands of the cockroach are sexual organs associated with the female genital. In cockroaches, these glands produce a proteinaceous secretion that covers two parallel rows of eight eggs during oviposition via the ovipositor. These secretions then become tanned and sculpted to form a rigid outer casing of the ootheca.

Therefore, the correct option is A.

Note: The conglobate gland is found in the abdominal segment of the male cockroach. It is a club-shaped gland, which aids in the fertilization process of the cockroach. The prothoracic glands are a pair of endocrine glands situated in the prothorax of certain insects that regulate molting or the shedding of the outer exoskeleton layer. The mushroom gland is a large accessory male reproductive gland in the cockroach, located at the junction of vasa the ejaculatory duct which aids in the fertilization of the eggs during copulation.