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Water passes from one vessel element to the next through which structure?
APits in the side walls
BPerforation plates at the ends
CSieve plates at the junctions
DCasparian strips in the walls
Answer & Solution
Correct answer: B. Perforation plates at the ends
1. Both tracheids and vessel elements conduct water, but they hand it on in different ways.
2. Water moves from one tracheid to another through pits, which are side wall regions where the secondary wall is absent.
3. Vessel elements are shorter and thinner walled, and each is joined to the next by a perforation plate at the end walls.
4. Water therefore travels up the plant through those perforation plates.
5. Pits are the trap here because they are the matching structure in the other xylem cell type.
6. Sieve plates belong to phloem sieve tubes, and the Casparian strip is a waxy band in the root endodermis.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.2 Stems_
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