The central lumens are obliterated in

Given below are two statements:
Statement $I$: Parenchyma is living but collenchyma is dead tissue.
Statement $II$: Gymnosperms lack xylem vessels but presence of xylem vessels is the characteristic of angiosperms.
In the light of the above statements,choose the correct answer from the options given below:

The annular and spirally thickened conducting elements generally develop in the protoxylem when the root or stem is

Differentiate between Tracheids and Vessels.

Cytoplasmic strands are present in

The end walls of tracheids and vessels,respectively,are: