Which of the following cells are studied during translocation of solutes?
Sieve tube cells
Companion cells
Phloem fibre
Xylem fibre
Phloem in gymnosperms lacks
The tissue which is living but does not possess nucleus in mature stage is
Which is not correct for vessels ?
Collenchyma is
$A$ : Cells of sclerenchyma have thickened secondary walls.
$R$ : Cells have deposition of lignin.