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  • Tyloses are formed by  Option: 1 Xylem vesselsOption: 2 Xylem fibres<

Tyloses are formed by
 

Option: 1

Xylem vessels


Option: 2

Xylem fibres


Option: 3

Xylem tracheids


Option: 4

Xylem parenchyma

 


Answers (1)

best_answer

 

  • When a transverse section of a woody trunk is taken, two regions are distinctly visible.
  • In the center, there is dark-coloured wood called heartwood. 
  • Heartwood is made up of dead and non-functional components of wood. 
  • Heartwood is also called duramen.
  • The lumen of vessels in the heartwood has been blocked by tyloses.
  • Tyloses are balloon-like structures formed due to the protrusion of xylem parenchyma cells into the lumen of vessels.
  • These parenchyma cells become lignified and dead, thereby making the vessels non-functional.
  • In the tracheids of gymnosperms, the tylosoids are present.
  • Heartwood is durable and resistant to parasitic and microbial attacks. 
  • It gives mechanical support to the tree trunk.
  • It appears dark due to the deposition of organic compounds like tannins, resins, oils, gums, aromatic substances and essential oils.
  • In the periphery of the tree trunk, surrounding the heartwood, there is lighter-colored wood made up of functional xylem elements.
  • This is called sapwood. It is involved in the conduction of sap. 
  • Sapwood is also called alburnum.
     

- Tyloses are balloon-like structures formed due to the protrusion of xylem parenchyma cells into the lumen of vessels.

Posted by

SANGALDEEP SINGH

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