Discussion
Central vascular cylinder or stele consists of the primary vascular system (xylem and phloem) and the associate fundamental tissue. Match the schematics of stele in Group I (xylem shown in green, and phloem shown as a square grid) with their respective types in Group II.
Group I:
Group II: (1) Protostele; (2) Eustele; (3) Atactostele; (4) Ectophloic siphonostele; (5) Amphiphloic siphonostele
Answer: A
The match is P-2; Q-4; R-1; S-3.
- P, a ring of separate collateral bundles with phloem outside the xylem around a central pith, is a eustele, typical of dicot and gymnosperm stems.
- Q, a continuous cylinder of xylem around a pith with phloem only on the outside, is an ectophloic siphonostele.
- R, a solid central core of xylem surrounded by phloem with no pith, is a protostele, the simplest type.
- S, with many bundles scattered through the ground tissue, is an atactostele, characteristic of monocot stems.
An amphiphloic siphonostele would show phloem on both sides of the xylem ring, which none of the drawings has, so options using item 5 are wrong.
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