Q15 of 45 Page 177

Breathing cycle is an essential process for the exchange of gases’. Justify this statement.

Breathing involves intake of oxygen and release out of CO2 from the body. If this process does not occur in the body, there will be no exchange of gases. Imagine a situation when we stop breathing, that is there will be no intake of oxygen and no release out of CO2. In that situation, oxygen supply will be stopped in our body and there will be continuous accumulation of CO2 inside the body. This can be fatal and the person may die because of suffocation. That is why it is said that breathing cycle is an essential process for the exchange of gases.


More from this chapter

All 45 →
13

Distinguish between aquatic and terrestrial respiration.

 14

With a schematic diagram, explain the overall process of respiration in animals.

 16

If a person holds his breath after expiration for about 25 sec, would there be occurrence of any exchange of respiratory gases in the lungs during this period? Explain.

 17

Raman kept a plant in his room. Adequate light was provided and the plant was extensively watered. Instead of flourishing the plant died. Raman asked his teacher for an explanation for the same.

Read the passage and answer the following questions.


(i) Even though the plant was watered, it soon died. Give reason.


(ii) How do plants respire? Name the organelle responsible for gaseous exchange in


(a) Herbaceous plants


(b) Woody plants


(iii) What values does Raman have in your opinion?