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Passage cells are thin walled cells found in

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

Correct answer: endodermis of roots facilitating rapid transport of water from cortex to pericycle

Solution

Passage cells are thin-walled endodermal cells in roots, usually opposite the protoxylem. They remain unsuberized, allowing rapid movement of water and minerals from the cortex to the pericycle/vascular cylinder.

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