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Casparian strips are present in
Option: 1
Passage cells
Option: 2
Endodermal cells other than passage cells
Option: 3
General cortical cells
Option: 4
Hypodermal cells
Answers (1)
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.
TIP:
- The cortex is homogenous in roots as the hypodermis is absent.
- The term ‘ground tissue’ is used to refer to undifferentiated general cortex and hypodermis.
-
The endodermal cells are characterised by the presence of suberin in the form of bands or strips that are called casparian strips.
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