Question

The third layer of spermatophore is secreted by

• A. Phallic gland
• B. Mushroom gland
• C. Seminal vesicle
• D. None of these

Answer 1

The correct option is A

Phallic gland

The correct option is A.

Explanation of correct option:

1. The sperms of cockroaches is stored in the seminal vesicle are bundled together to form a spermatophore.
2. It is pear-shaped and is about 13mm in diameter.
3. These spermatophores are surrounded by three layers.
4. The innermost layer receives the spermatophore from the short tubules of the utricular gland.
5. The middle layer receives the spermatophore from the ejaculatory duct.
6. The phallic gland present in the male cockroach secretes the outermost layer.
7. It is present in between the ejaculatory duct and abdomen.
8. So, the third layer of spermatophore is secreted by the phallic or conglobate gland.

Explanation of incorrect options:

Option B:

1. The mushroom gland is also called as utricular gland.
2. They have a large number of tubules.
3. The innermost layer receives the spermatophore from these short tubules of the mushroom gland.

Option C:

1. Spermatophores are bundled together and stored in the seminal vesicle.
2. It doesn’t secrete spermatophores.

Option D:

1. Phallic or conglobate gland secretes the third layer of spermatophore.

Final answer: The third layer of spermatophore is secreted by phallic gland.