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Q: Air enters the body of cockroaches through…..
  • A. Lungs
  • B. gills
  • C. spiracles
  • D. skin
Correct Answer: Option C - Cockroaches can hold their breath for upto seven minutes. Their respiratory system is highly efficient but there are no lungs. Instead, the insects draw in air through external valves called spiracles and transport the air directly to the cells via tubes called tracheae.
C. Cockroaches can hold their breath for upto seven minutes. Their respiratory system is highly efficient but there are no lungs. Instead, the insects draw in air through external valves called spiracles and transport the air directly to the cells via tubes called tracheae.

Explanations:

Cockroaches can hold their breath for upto seven minutes. Their respiratory system is highly efficient but there are no lungs. Instead, the insects draw in air through external valves called spiracles and transport the air directly to the cells via tubes called tracheae.