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  • Which of the following is imperforated?  Option: 1 TracheidsOption: 2 Vessel

Which of the following is imperforated?

 

Option: 1

Tracheids


Option: 2

Vessels


Option: 3

both a and b


Option: 4

None of these


Answers (1)

 

 

Elements of Xylem - Tracheids and Vessels -

Tracheids:

  • Tracheids can originate from procambium or vascular cambium.
  • These are elongated cells.
  • They have a thick and lignified cells. 
  • Their lumen is wider than that of fibres.
  • Their end walls are tapering.
  • The perforation (pits) are seen on the face walls.
  • At maturity, these are dead and devoid of protoplasm.
  • These are primitive and fundamental type of xylem cells.
  • These are present in all the plants of Tracheophyta. 
  • Ancient vascular plants only have tracheids in their xylem.
  • In the metaxylem of gymnosperms, the bordered pits are very common.

 

 

- 

 

Tracheids are imperforated as their end walls are closed and tapering.

Posted by

Ramraj Saini

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