During inspiration,the diaphragm

The intake and output of air from the lungs is helped by

Explain the mechanism of breathing with neat labelled sketches.

Sugar is converted into starch when the $pH$ of guard cells increases,which is associated with:

Lung ventilation movements are due to

Arrange the given steps by which the lungs show inspiration,in the sequence of events occurring first:
$I.$ Increase in the volume of the thoracic chamber in the dorsoventral axis
$II.$ Upward and outward movement of the ribs
$III.$ Contraction of intercostal muscles
$IV.$ Entry of air inside the lungs
$V.$ Contraction of the diaphragm
$VI.$ Increase in the volume of the thoracic chamber in the anteroposterior axis
Choose the correct option.