Which of the following statements is not true for stomatal apparatus?
Guard cells invariably possess chloroplasts and mitochondria.
Guard cells are always surrounded by subsidiary cells.
Stomata are involved in gaseous exchange.
Inner wall of guard cells are thick.
Cavity or a gland formed by the separation is
Vascular bundle, in which two patches of phloem are present on both sides of xylem is
$I.$ Found only in sporophytic phase of life cycle
$II.$ May contain enzymes that are biologically active
$III.$ Often contain strengthening polymers
Select the correct option for cell wall