alleryStart learning →Xylem tissue is built from which three cell types?
ASieve cells, companion cells and phloem fibres
BVessel elements, tracheids and xylem parenchyma
CTracheids, sieve-tube cells and cork cells
DVessel elements, guard cells and sclereids
Answer & Solution
Correct answer: B. Vessel elements, tracheids and xylem parenchyma
1. Xylem carries water and nutrients from the roots to the rest of the plant.
2. It is made of three cell types, namely vessel elements and tracheids, which both conduct water, plus xylem parenchyma.
3. Sieve cells, companion cells and phloem fibres belong to phloem, not xylem, so that option mixes the two tissues.
4. Guard cells flank stomata in the epidermis and cork cells form bark, so neither is a xylem cell.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.1 The Plant Body_
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