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Solution


Q.

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

A normal human heart is a strong, hard-working pump made of muscle tissues. It is about the size of a person’s fist. The heart comprises four chambers. The upper two chambers are known as atria, and the lower two are known as ventricles. These chambers are separated by a wall of tissue known as the septum. Blood is pumped through the chambers, assisted by four heart valves. The valves open and close to allow blood flow in only one direction.

 

(iv) Which one of the statements given below is not true
1 Valves ensure that blood does not flow backwards when the atria or ventricles contract.  
2 Amphibians or many reptiles have three chambered hearts, but they do not tolerate mixing of the oxygenated and de-oxygenated blood streams.  
3 Vertebrates have double circulation procedure.  
4 De-oxygenated blood comes from the body to the upper chamber on the right.  

Ans.

(2)