Q5 of 45 Page 178

The diagram shows part of the human gas exchange system.


What are W, X, Y and Z?


Larynx (voice box) is present at the opening of trachea. Then the air goes into trachea-passage for air to lungs. Near the entry of trachea into lungs, it gets divided into bronchi (sing. bronchus) which further gets divided into bronchioles.

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3

Which substances are produced by anaerobic respiration in yeast?

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The following changes take place in an athlete’s body during a 100m race. Which change occurs first?

 6

An experiment is set up as shown. Flasks 1 and 2 contain lime water. Air is pumped through the flasks.


What is the appearance of lime water flasks 1 and 2 after a period of ten minutes?


 7

The diagram shows the ribs and some of the muscles used in breathing.


Which muscles relax in moving from position x to position y?