Thick-walled and lignified with simple pits in walls and non-prosenchymatous cells without living protoplasm usually isodiametric or irregular in shape are
Parenchyma
Collenchyma
Fibres
Sclereids
Xylem position in secondary xylem is
The chief water conducting elements of xylem in gymnosperms are
Lignified cell wall is the characteristic feature of
The first formed primary phloem is referred as ...$A$... The later formed primary phloem is referred as ...$B$...
Choose the correct combination of $A$ and $B$