MCQ
Stem grows in girth due to:
- AOuter cortical.
- BEpidermis.
- ✓Vascular cambium.
- DPhellogen.
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$I.$ Breathing or pulmonary ventilation
$II.$ Diffusion of $O _{2}$ and $CO _{2}$ between blood and tissues
$III.$ Transport of gases by blood
$IV.$ Utilisation of $O_{2}$ by cells
$V.$ Diffusion of $O _{2}$ and $CO _{2}$ across the alveolar membrane
Choose the correct option