Question : What is protostele? Explain its types.

1.	Question : What is protostele? Explain its types.
Answer» Solution :In protostele xylem surrounds phloem. The type includes Haplostele, ACTINOSTELE, Plectostele and mixed protostele. (i) Haplostele: Xylem surrounded by phloem is known as haplostele. E.g. Selaginella. (ii) Actinostele: Star shaped xylem CORE is surrounded by phloem is known as actinostele. E.g. Lycopodium serratum (III) Plectostele: Xylem plates altermates with phloem plates. E.g. Lycopodium clavatum. (IV) Mixed prototostele: Xylem groups UNIFORMLY scattered in the phlocm. E.g. Lycopodium cermuum.

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