| (i) Air pressure inside the bell jar increases- |
| (ii) The balloons inside jar expand. |
| (iii) This is similar to expansion of lungs during inhalation. |
| (iv) This is similar to contraction of lungs during exhalation. |
A) (ii), (iii) and (iv) only
B) (ii) and (iii) only
C) (i) and (iv) only
D) (i), (iii) and (iv) only
Correct Answer: B
Solution :
In the given experimental set up, when the rubber sheet is pulled down, the space in the bottle increases and the balloons inside the jar get inflated. If the balloons represent the lungs, the rubber sheet is the diaphragm and the plastic bottle is equivalent to the chest cavity, then this set up represents inhalation.
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