Bordered pits are found in

$I.$ These tissues are found as layers or patches.
$II.$ It consists of cells which are thickened at the corners.
$III.$ It often contains chloroplasts.
$IV.$ Intercellular spaces are absent.
$V.$ They provide mechanical support to growing parts of plants.
The above characters are attributed to:

All the following statements regarding sieve tube elements are true except

Which type of fibers are primarily found in the phloem tissue?

The cell wall of xylem cells is rich in

The xerophytic plants conserve water by storing it in