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Passage cells are thin walled cells found in
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- phloem elements that serve as entry points for substance for transport ot other plant parts
- testa of seeds to enable emergence of growing embryonic axis during seed germination
- central region of style through which the pollen tube grows towards the ovary
- endodermis of roots facilitating rapid transport of water from cortex to pericycle.
Correct Option: D
The innermost layer of the cortex is called endodermis. It comprises a single layer of barrel shaped cells without any intercellular spaces. In roots thick walled endodermal cells are interrupted by thin walled passage cells or transfusion tissue.
