Match the stele-type with its description.ProtosteleSiphonostele.pdf

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Protostele - Describes a stele where the xylem forms an uninterrupted cylinder within phloem, found in simple seedless plants. Siphonostele - Describes a stele where phloem surrounds an inner cylinder of xylem, which is surrounded by an outer cylinder of phloem, with parenchyma in the center, found in ferns. Eustele - Describes a stele with vascular bundles arranged in a ring, with phloem outside and xylem inside, found in gymnosperms and dicots. Dispersed stele - Describes a stele with scattered vascular bundles with inconsistent orientation of

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Match the stele-type with its description.
Protostele
Siphonostele
Eustele
Dispersed stele
The xylem forms an uninterrupted cylinder within a cylinder of phloem; found in the stems of
very simple seedless vascular plants.
A cylinder of phloem surrounds a cylinder of xylem which surrounds another cylinder of
phloem, with a pith of parenchyma cells at the center; found in the stems of ferns and fern allies.
The stele is broken into vascular bundles that are arranged in a ring with the phloem on the
outside and the xylem on the inside; commonly found in gymnosperms and dicots.
The stele is broken into vascular bundles that are scattered in cross section so that the orientation
of xylem and phloem is inconsistent from vascular bundle to vascular bundle; found in
monocots. - A. B. C. D.
Protostele - A. B. C. D.
Siphonostele - A. B. C. D.
Eustele - A. B. C. D.
Dispersed steleA.
The xylem forms an uninterrupted cylinder within a cylinder of phloem; found in the stems of
very simple seedless vascular plants.B.
A cylinder of phloem surrounds a cylinder of xylem which surrounds another cylinder of
phloem, with a pith of parenchyma cells at the center; found in the stems of ferns and fern
allies.C.
The stele is broken into vascular bundles that are arranged in a ring with the phloem on the
outside and the xylem on the inside; commonly found in gymnosperms and dicots.D.
The stele is broken into vascular bundles that are scattered in cross section so that the orientation
of xylem and phloem is inconsistent from vascular bundle to vascular bundle; found in
monocots.
Solution
A). The xylem forms an uninterrupted cylinder within a cylinder of phloem; found in the stems
of very simple seedless vascular plants. ---> Protostele
B). A cylinder of phloem surrounds a cylinder of xylem which surrounds another cylinder of
phloem, with a pith of parenchyma cells at the center; found in the stems of ferns and fern allies.

---> Siphonostele
C). The stele is broken into vascular bundles that are arranged in a ring with the phloem on the
outside and the xylem on the inside; commonly found in gymnosperms and dicots. ----> Eustele
D). The stele is broken into vascular bundles that are scattered in cross section so that the
orientation of xylem and phloem is inconsistent from vascular bundle to vascular bundle; found
in monocots ----> Dispersed stele

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