Multiple choice

Path of sap movement is the lumen of

  1. xylem

  2. phloem

  3. pith

  4. casparian cells
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A Correct answer
Explanation

The xylem is the primary water-conducting tissue in plants. Sap (water and dissolved minerals) moves upward through the hollow lumens of dead xylem vessel elements and tracheids. This transpiration stream is driven by water potential gradients created by transpiration from leaves. Phloem transports organic nutrients (sugars), pith is a storage tissue, and casparian cells are part of the endodermis.

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