What is the difference between-
i.Tracheids and vessels
ii.Sieve plates and sieve tubes
(i) Differences between tracheids and vessels
Tracheids | Vessels |
They are unicellular elements of xylem and are small in size. | Vessels are multicellular and large in size. |
They are narrow in lumen due to more lignified walls. | They are broad in lumen due to less lignified walls. |
The ends are tapering or oblique and closed. | The ends are rounded and open. |
They are found in pteridophytes, gymnosperms and a few angiosperms. | They are found only in angiosperms. |
For the second (ii) part of your question you may refer to the answer provided by your friends.
@Others...Good work..Keep posting!