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B
Walls of tracheary elements
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C
Xylem parenchyma
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D
Lumen of tracheary elements
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Solution
The correct option is A Lumen of tracheary elements
The water with dissolved minerals is called sap. The upward transport of water along with dissolved minerals from roots to the aerial parts of the plant is called ascent of sap. It takes place through the xylem. In herbaceous plants, the lumen of tracheary elements of xylem participate in the ascent of sap.
So the correct answer is 'Lumen of tracheary elements'.