Walls of sclerenchyma are
Rigid
Lignified
Pactinised
Suberised
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 $B$
Lignification is associated with
Tracheids of angiosperms are recognised by the presence of
Collenchyma differs from parenchyma in having