Give differences : Sieve cell and Sieve tubes

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:

Conjuctive tissue is made up of

Which of the following supporting tissues have cells with unequally thickened walls

In parenchyma, thickening is of