Which of the following statements is incorrect?

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Cockroaches exhibit mosaic vision with less sensitivity and more resolution.

A mushroom- shaped gland is present in the $6^{th}$ - $7^{th}$ abdominal segments of male cockroach.

A pair of spermatheca is present in the $6^{th}$ segment of female cockroach.

Female cockroach possesses sixteen ovarioles in the ovaries.

answer is A.

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Detailed Solution

Cockroaches exhibit mosaic vision with more sensitivity and less resolution.
(2) A mushroom-shaped gland is present in the 6th - 7th abdominal segments of the male cockroach. It contains long peripheral tubules that form the inner layer of the spermatophore and short central tubules that nourish the spermatozoa.
(3) In female cockroaches, sperms are stored in spermatheca present in the 6th abdominal segment.
(4) The female cockroach has a pair of ovaries, each containing eight ovarioles. The ovarioles contain a linear series of ova at different stages of development.

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