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Casparian strips occur in

1. Radial walls of endodermis
2. Radial walls of phellem cells
3. Radial walls of epidermal cells
4. None of the above

Correct answer: Radial walls of endodermis

Solution

Casparian strips are found in the endodermis, where they block apoplastic movement and force water and minerals through cell membranes. This selective barrier is located in the radial and transverse walls of endodermal cells.

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