In Cockroach, ootheca is produced by secretion ofa)Conglobate glandb)Phallic glandc)Colleterial glandd)Mushroom glandCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Cockroach belongs to phylum Arthropoda which is the largest phylum. These have joint appendages and a segmented body. The secretions of colleterial glands form the egg case or ootheca around the fertilised eggs in the oothecal chamber

Answer

In cockroach, a pair of much branched accessory or collaterial glands lies behind and above the ovaries. Secretion of the collaterial glands forms the hard egg case or ootheca around groups of eggs.

Answer

Answer:

In cockroaches, the ootheca is a protective egg case that contains multiple eggs. It is produced by the secretion of the colleterial gland, also known as the cement gland. The colleterial gland is a pair of glands located in the posterior region of the female reproductive system in cockroaches.

Function of the Colleterial Gland:
The colleterial gland secretes a sticky substance that serves as a cement-like material. This substance is used by the female cockroach to create and attach the ootheca to a suitable surface, providing protection for the developing eggs. The secretion from the colleterial gland hardens upon exposure to air, forming a rigid structure that safeguards the eggs from desiccation, physical damage, and predation.

Formation of the Ootheca:
The process of ootheca formation involves several steps:

1. Secretion: The colleterial gland secretes the sticky substance, which is initially soft and pliable.

2. Extrusion: The female cockroach extrudes the secretion from the colleterial gland through the ovipositor, a specialized structure located at the end of the abdomen.

3. Ootheca Production: As the secretion is extruded, it comes into contact with air and hardens, forming a protective casing around the eggs.

4. Attachment: The female cockroach attaches the ootheca to a suitable surface, such as a crevice, wall, or other protected areas. The adhesive properties of the secretion help in firmly attaching the ootheca to the chosen surface.

5. Egg Deposition: The female then deposits the eggs into the ootheca through an opening at one end. The ootheca provides a safe environment for the eggs to develop and hatch.

Significance of the Ootheca:
The ootheca plays a crucial role in the reproductive cycle of cockroaches. It ensures the survival of the developing eggs by providing protection against external threats. The hardened structure of the ootheca acts as a shield, preventing the eggs from drying out or being easily consumed by predators. It also helps in the dispersal of the eggs, as the female cockroach can strategically place the ootheca in favorable environments.

Overall, the colleterial gland's secretion is responsible for the production of the ootheca in cockroaches, ensuring the survival and successful hatching of the eggs.

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