Respriatory system of cockroach is formed of spiracels and tracheal intercom. Why it is said to be more efficient than that of earthworm? Why inspritation of cockraoch is said to be a passive process while it is an active process in man?

Define tracheal intercom. Why is the respiratory system of cockroach more efficient than that of earthworm?

In insects,inspiration is called a passive process while expiration an active process.Why?

Why is the closed circulatory system more efficient than the open system?

Give reasons,why? The movement of ions form endodermis to xylem is an active process.

Do you consider passive smoking is more dangerous than active smoking ? Why ?

These questions consist of two statement each, printed as Assertion and Reason. While answering these questions, you are required to choose any one of the following four responses. A. If both Assertion and Reason are true and Reason is a correct explanation of the Assertion. B. If both Assertion and Reason are true but Reason is not a correct explanation of the Assertion. C. If Assertion is true but Reason is false. D. If both Assertion and Reason are false. Assertion: In angiosperms the conduction of water is more efficient because their xylem has vessels. Reason: Conduction of water by vessel elements is an active process with energy supplied by xylem parenchyma rich in mitochondira.

Explain why: Heating systems based on circulation of steam are more efficient in warming a building than those based on circulation of hot water.

Give the reasons for the following statements : Human circulatory system is more advantageous than cockroach circulatory system.Why?