Which of the following is not a component of phloem?

Grass leaves curl inwards during very dry weather. Select the most appropriate reason from the following:

Which of the following tissues are included in the ground tissue system?

The primary function of a vessel in plants is:

$A$ vascular bundle in which a group of xylem and a group of phloem are on the same radius with xylem near the pith and phloem near the cortex and both are not separated by the cambium,is called:

Which one of the following is not part of the Epidermal tissue system?