The movement of carbohydrates from the leaves of the tree to the root is primarily a function of the
Xylem
Phloem
Epidermis
Cambium
Plant cells without the nucleus are
Xylem position in secondary xylem is
$A$ : Sieve tubes and companion cells are related ontogenetically.
$R$ : Both develop from same mother cell.
Give functions of companion cells.
Which simple tissue is found in pulp of fruits like guava, pear and sapota ?