WB JEE Medical WB JEE Medical Solved Paper-2015

  • question_answer Passage cells help in

    A)  transport of water towards pericycle

    B)  transport of water towards epiblema

    C)  absorption of water from soil

    D)  passage of\[\text{C}{{\text{O}}_{\text{2}}}\] towards stomata

    Correct Answer: A

    Solution :

     Passage cells are endodermal cells of older roots whichhave ratained thin walls and casparian strips rather than becoming suberised and waterproof like the other cells around them, to continue to allow some symplastic flow to the inside. The radial arrangement of vascular bundles and the presence of these passage cells opposite the protoxylem facilitates the inflow of water from the pericycle in the root hair zone.

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