Which cells are functionally associated with sieve tubes?

What is the thickening material present in this tissue?

Bordered pits are found in . . . . . . .

Differentiate between Tracheids and Vessels.

Bordered pits,which are related to water uptake,are located 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: