A) protostele
B) siphonostele
C) solenostele
D) None of these
Correct Answer: A
Solution :
The stele without pith is protostele. The protostele is most primitive stele which consists of a solid core of xylem surrounded by phloem and pericycle. Siphonostele is medullated stele. Leaf gaps are absent in siphonostele. Solenostele is similar to siphonostele but has scattered leaf gaps so that in T.S. it appears horseshoe-shaped.
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