Question

Distinguish between tracheids and vessels?​

Answer 1

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✨Tracheids

→They are unicellular.

→Their ends are tapering and oblique.

→They are small in size.

→They are more lignified and have so many narrow lumens.

→They are found in pteridophtes (ferns), gymnosperms and a few angiosperms.

✨Vessels .

→They are multicellular.

→Their ends are rounded or transverse.

→They are large in size.

→They are less lignified and have so many wide lumen.

→They are found only in angiosperms.

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Answer 2

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Tracheids:-

1. Main conducting elements of pteridophytes and gymnosperms

2. Tracheids originate from single cells

3.  Tracheids have a comparatively narrow diameter

4. They have large pits which are less in number

5. They are imperforated cells

6. They are less efficient in water conduction due to the absence of perforations

7. Walls are more thickened with narrow lumen

8. Average length upto 1 m. m (rarely 12 cms.)

Vessels:-

1.  Main conducting elements of angiosperms

2.  Vessel members, which are joined into long continuous tubes, originate from longitudinal file of cells

3. Vessels have a comparatively wide diameter

4. They have small pits which are larger in number

5.They are perforated cells

6. They are more efficient in water conduction due to the presence of perforations

7. Walls are less thickened with large lumen

8. Average length upto 10 cms or more( Rarely 2-6 metres)