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Passage cells are thin-walled cells found in:

  1. A
    endodermis of roots facilitating rapid transport of water from cortex to pericycle
  2. B
    phloem elements that serve as entry points for substances for transport to other plant parts
  3. C
    testa of seeds to enable emergence of growing embryonic axis during seed germination
  4. D
    central region of style through which the pollen tube grows towards the ovary

Solution & Step-by-step Explanation

Passage cells are specialized, thin-walled endodermal cells found opposite the protoxylem points in roots. While most endodermal cells develop suberin thickenings (Casparian strips), passage cells remain thin-walled to allow the radial movement of water and dissolved minerals from the cortex into the vascular cylinder (pericycle).

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Passage cells are thin-walled cells found in:
A
endodermis of roots facilitating rapid transport of water from cortex to pericycle
B
phloem elements that serve as entry points for substances for transport to other plant parts
C
testa of seeds to enable emergence of growing embryonic axis during seed germination
D
central region of style through which the pollen tube grows towards the ovary

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Plant AnatomyEndodermisRoots

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