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In cockroach, the ootheca is formed by the secretion of 
  • a)
    phallic gland
  • b)
    collaterial gland
  • c)
    mushroom gland
  • d)
    conglobate gland
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
In cockroach, the ootheca is formed by the secretion ofa)phallic gland...
Collaterial glands are present in female cockroach as part of reproductive system. These glands are branched tubular glands opening independently on the dorsal side of the genital chamber. The secretion produced by these glands forms the oothecal case of ootheca.
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In cockroach, the ootheca is formed by the secretion ofa)phallic gland...
The Formation of Ootheca in Cockroach

The ootheca is a protective structure that houses the eggs of a cockroach. It is formed by the secretion of the collateral gland, which is located in the female reproductive system of the cockroach. Let's explore the process of ootheca formation in detail.

Collateral Gland:
The collateral gland is a specialized gland found in the reproductive system of female cockroaches. It is responsible for the secretion of a proteinaceous substance that forms the ootheca. This gland is located in the posterior region of the ovaries.

Process of Ootheca Formation:
The formation of the ootheca in cockroaches involves a series of steps. Here is a detailed explanation of each step:

1. Mating: Before the female cockroach can produce an ootheca, she must mate with a male cockroach. During mating, the male transfers sperm to the female's reproductive system.

2. Ovarian Development: After mating, the female cockroach's ovaries undergo development. The ovaries contain multiple ovarioles, which are tubular structures where the eggs are produced.

3. Egg Maturation: Inside each ovariole, the eggs undergo maturation. They develop a protective covering called the chorion, which is secreted by specialized cells in the ovariole.

4. Ootheca Formation: Once the eggs are mature, they move into the oviduct. At the junction of the oviduct and the collateral gland, the secretion from the collateral gland is added to the eggs. This secretion is proteinaceous and forms a foamy, sticky substance.

5. Ootheca Structure: As the foamy substance is secreted, it hardens and forms a protective casing around the eggs. This casing is the ootheca. It is elongated in shape and has a series of ridges or crests along its length. The ootheca provides protection to the eggs from desiccation, mechanical damage, and predators.

6. Ootheca Deposition: Once the ootheca is fully formed, the female cockroach deposits it in a suitable location. The ootheca can be attached to a surface, such as a wall or under furniture, using a sticky substance secreted by the female.

7. Egg Hatching: The eggs inside the ootheca undergo embryonic development. After a certain period, the eggs hatch into nymphs, which resemble miniature versions of adult cockroaches.

In conclusion, the ootheca in cockroaches is formed by the secretion of the collateral gland. This gland produces a proteinaceous substance that hardens and forms a protective casing around the eggs. The ootheca provides a safe environment for the eggs to develop and hatch into nymphs.
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In cockroach, the ootheca is formed by the secretion ofa)phallic glandb)collaterial glandc)mushroom glandd)conglobate glandCorrect answer is option 'B'. Can you explain this answer?
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