Passage cells are thin walled cells found in

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

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