Question

Number of longitudinal tracheal trunks in Cockroach is

• A. Three pairs
• B. Three
• C. Two
• D. Two pairs

Answer 1

Answer: (A)

Three pairs

The thoracic spiracles lead into several horizontal trachea, where as each abdominal spiracle leads into atria. From each abdonimal spiracle 3 tracheal tubes arise.

All these tracheal tubes of one side open into three separate longitudinal tracheal trunks.

They are lateral, dorsal and ventral longitudinal trunks. The three pairs of longitudinal tracheal trunks of both the sides are interconnected by many tracheae.

So, the correct answer is'Three pairs'.