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  • Passage cellsOption: 1 Lack suberin stripOption: 2 Are present opposite to protoxylem</

Passage cells

Option: 1

Lack suberin strip


Option: 2

Are present opposite to protoxylem


Option: 3

Contain the casparian strips


Option: 4

Only a and b


Answers (1)

best_answer
 

Endodermis or Starch sheath

  • It is the innermost layer of the cortex.
  • It is single layered.
  • The endodermal cells are compactly arranged.
  • The endodermal cells are vertically elongated and appear barrel-shaped in cross section. 
  • The endodermal cells are characterised by the presence of suberin in the form of bands or strips that are called casparian strips.
  • Lignin may also be present in the casparian strips.
  • The endodermal cells that lack casparian strips are called passage cells. These are present just opposite to the protoxylem.
  • Endodermis is absent in woody stem of dicot angiosperms and gymnosperms. 
  • Endodermis is absent in angiosperm leaves.
  • Endodermis behaves as water tight dam to check the loss of water and air dam to check the entry of air in xylem elements. 

The endodermal cells that lack casparian strips are called passage cells. These are present just opposite to the protoxylem.

Posted by

Sanket Gandhi

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