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How is the vascular tissue arranged in a monocot root compared with a dicot root?
AAn X shape in monocots, a ring in dicots
BA ring in both monocots and in dicots
CAn X shape in both monocots and dicots
DA ring in monocots, an X shape in dicots
Answer & Solution
Correct answer: D. A ring in monocots, an X shape in dicots
1. Root vascular tissue sits in the stele, and its pattern differs between the two flowering plant groups.
2. In dicot roots the xylem and phloem of the stele alternate in an X shape.
3. In monocot roots the vascular tissue forms a ring around the central pith.
4. So the correct pairing is a ring for monocots and an X for dicots.
5. Reversing the two is the standard trap, since the stem pattern also puts a ring in dicots and invites the swap.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 30 "Plant Form and Physiology", section 30.3 Roots_
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