Question

1. Modern insects have an anatomically localized tracheal system for gas exchange that is coupled to an open circulatory system for the distribution of vital substances such as oxygen and nutrients.

   True

   False

Answer 1

It is false.because

• The circulating hemolymph, or blood, is not important in respiration but functions in transporting nutrients to all parts of the body and metabolic waste products from the organs to the malpighian tubules for excretion.
• The muscular valves of the spiracles, of repiratory system is closed most of the time, but open only to allow the uptake of oxygen and the escape of carbon dioxide.
• So both system are independant.nutrients cirxulated by circulatory system while oxgen circulated by only respiratory system.