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Solution


Q.

Read the passage given below and answer the following questions from (i) to (v):

As the heart beats, it pumps blood through a system of blood vessels, called the circulatory system. The vessels are elastic, muscular tubes that carry blood to every part of the body. Blood is essential. In addition to carrying fresh oxygen from the lungs and nutrients to the body's tissues, it also takes the body's waste products, including carbon dioxide, away from the tissues. This is necessary to sustain life and promote the health of all parts of the body.
When we are injured and start bleeding, the loss of blood from the system has to be minimised. In addition, leakage would lead to a loss of pressure which would reduce the efficiency of the pumping system.

 

(iii) Why is it necessary to separate oxygenated and deoxygenated blood in mammals and birds
1 Mixing of blood would lead to clotting.  
2 For efficient supply of oxygen and to maintain body temperature.  
3 Birds need more blood for flying.  
4 None of these  

Ans.

(2)