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Diversity in Living Organisms — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceDiversity in Living Organisms5 Marks
Question
Identify the plant bodies, which are commonly named as “cryptogamae”. State and explain two characteristics which are exhibited by each category of these plant bodies.
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Answer

Plant bodies which are commonly named as “cryptogamae” are:
  1. Thallophyta.
  2. Bryophyta.
  3. Pteridophyta.
Characteristics of these plant bodies are:
  1. Thallophyta:
  • Plants have an irregular shaped undifferentiated body called thallus.
  • Vascular tissues are absent.
  1. Bryophyta:
  • The plant body is commonly differentiated to form stem and leaf-like structures.
  • There is no specialised tissue for the conduction of water and other substances from one part of the plant body to another.
  1. Pteridophyta:
  • The plant body is differentiated into roots, stem and leaves.
  • These plants have specialised tissue for the conduction of water and other substances from one part of the plant body to another.

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