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Plant Kingdom — BIO BOTANY STD 11 — Question

Tamilnadu BoardEnglish MediumSTD 11BIO BOTANYPlant Kingdom5 Marks
Question
What is protostele? Explain its types.
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Answer

In protostele xylem surrounds phloem. The type includes Haplostele, Actinostele, Plectostele and mixed protostele.
  1. Haplostele: Xylem surrounded by phloem is known as haplostele. E.g. Selaginella.
  2. Actinostele: Star shaped xylem core is surrounded by phloem is known as actinostele. E.g. Lycopodium serratum.
  3. Plectostele: Xylem plates alternates with phloem plates. E.g. Lycopodium clavatum.
  4. Mixed prototostele: Xylem groups uniformly scattered in the phloem. E.g. Lycopodium cernuum.

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