Multiple choice

Identify the incorrectly matched pair.

  1. Heplostele : Plate-like regions of xylem appear in transverse section surrounded by phloem tissue

  2. Actinostele : A variation of the protostele in which the core is lobed

  3. Solenostele : Cylinder of vascular tissue contains no more than one leaf gap in any transverse section

  4. Eustele : Primary vascular tissue that consists of vascular bundles in one or two rings around the pith

  5. Plectostele : A protostele in which plate-like regions of xylem appear in transverse section surrounded by phloem tissue
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A Correct answer
Explanation

Haplostele consists of a cylindrical core of xylem surrounded by a ring of phloem. An endodermis generally surrounds the stele. A centrarch (protoxylem in the center of a metaxylem cylinder) haplostele is prevalent in members of the rhyniophyte grade, such as rhynia.

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