Question

Gonapophysis are
A. Mouth Parts
B. Plates bearing spiracles
C. Joints between sclera
D. External genitalia

Answer 1

Hint: Gonapophysis are the organs present in cockroaches which are usually found at unhygienic places. It is a chitinous sheet-like structure found in the cockroaches. In males, generally, the number of gonapophysis is half of the number present in females.

Complete answer: The reproductive system is finely developed in both the male and female cockroaches. There is an accessory reproductive gland in the 6th and 7th abdominal sections that is mushroom-shaped. Chitinous asymmetrical structures are known as male gonapophysis or phallomere from the external genitalia.
There are three phallomeres or male gonapophysis which comprise the external genitalia - Right Phallomere, Ventral Phallomere, and Left Phallomere.
Insect mouthparts comprise three appendages, the paired mandibles, the paired maxillae, and the unpaired labium with additional head structures, the labrum, and the hypopharynx. Spiracles are the holes of the tracheal system on the integument of the insect.
The entire body of the cockroach is wrapped by a hard chitinous exoskeleton. In every segment, the exoskeleton has stiff plates called sclerites that are linked to each other by a thin and elastic articular membrane known as the arthrodial membrane.
So, the correct answer is “Option D”.

Note:
The cockroaches are unisexual animals. Gonapophysis is a structure or process that serves in copulation, oviposition, or throbbing of an insect's anal region. In male cockroach gonapophysis, some asymmetric chitinous structures are revealed at the end of the abdomen enclosing the masculine gonopore. These are three phallomers or male gonapophysis that craft up the outer genitalia.