Question

In female cockroach, ootheca is secreted by
(a)Oothecal chamber
(b)Common oviduct
(c)Colleterial glands
(d) Parenial gland

Answer 1

Hint: The Ootheca producing organ is present in between the 3rd and 4th abdominal segments of the female cockroach. These organs are found in pairs and are branched structures.

Complete answer:

The ootheca is made up of proteins which usually hardens up into a strong protective covering.
The ootheca is formed by a pair of colleterial glands. The two ovaries release the egg alternatively in the common oviduct after which they go through the gonopore to reach into the genital chamber, where the fertilization takes place by the sperms from the spermatheca.
The fertilized eggs are now coated by the secretion of scleroprotein from the colleterial glands gland which makes them hard and dark brown.
The ootheca is shaped by the ovipositor and is about 12mm in length, containing about 16 eggs standing vertically in two rows. This process of ootheca formation takes a day and then ootheca protrudes from the oothecal chamber and is held in place. The female cockroach carries the ootheca for several days and drops it in a dark and dry place.

So, the correct answer is, “ Colleterial glands.”

Note:
 Every female cockroach produces about 15 to 40 ootheca in its total one to two years of life span.After the ootheca matures up and ruptures, the young one hatch out, these are called nymphs and are just like the adult cockroach except they are smaller and have no wings.
The nymph of a cockroach undergoes metamorphosis to develop into an adult cockroach. The nymph undergoes molting about 13 times to develop in a full cockroach.