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Which of the following has end wall perforated or completely dissolved?
Option: 1
Xylem fibres
Option: 2
Vessel elements
Option: 3
Tracheids
Option: 4
Libriform fibres
Answers (1)
Elements of Xylem - Tracheids and Vessels -
Vessels:
- These arise from procambium during the primary growth and from vascular cambium during secondary growth.
- The pattern of secondary wall deposition is determined by the microfibrils.
- Vessels are made up of vessel elements placed one over the other.
- Vessel elements have perforated end walls.
- Hence, vessels are multicellular pipe-like structures.
- They have comparatively a wider lumen than tracheids.
- At maturity, they are devoid of protoplasm and are dead.
- In pteridophytes and gymnosperms, the vessels are absent. Their wood is called the non-porous wood.
- In angiosperms, the vessels are present. Their wood is called the porous wood.
TIP:
Ephedra and Gnetum are the gymnosperms that have vessels. Selaginella and Pteridium are the pteridophytes that have vessels.
Winteraceae, Trochodendraceae and Tetracentraceae of Angiosperms do not have vessels.
-
End wall perforation is seen in vessel elements.
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