Which of the following statements is incorrect pertaining to cockroach ?
Ostia have valves which allow the blood to pass only into the heart
The wall of the trachea is made with lamina propria, endothelium and taenidia
Thoracic and abdominal spiracles are valvular
The taenidia keep the trachea always open and prevent it from collapsing
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
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Solution
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All abdominal and thoracic spirales are not valvular. Out of the 10 pair of spiracles present on the body, 1st pair of spiracles of both thorax and abdomen are valveless. So, they always remain open.
So, the correct option is 'Thoracic and abdominal spiracles are valvular'.
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