Which of the following statements is incorrect pertaining to cockroach

Options

A. Ostia have valves which allow the blood to pass only into the heart
B. Thoracic and abdominal spiracles are valvular
C. The wall of the trachea is made with lamina propria endothelium and taenidia
D. The taenidia keep the trachea always open and prevent it from collapsing

Answer

B

Explanation

Respiratory system of insects (cockroach ) is made of tracheae, which are cuticularised (taenidia) and non - collapside (character common with mammals ). Tracheoles are not cuticularised. They carry air (oxygen ) to all cells of body - Cockroach has two pairs of thoracic and eight pairs of abdominal spiracles. These thoracic and abdominal spiracles do not have valves.