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Difficulty: EasyThallophytes, Bryophytes, and Pteridophytes

Plant classification is based on structural complexity and body organization. Which feature uniquely characterizes Thallophytes when compared to Bryophytes and Pteridophytes?

  1. An undifferentiated plant body lacking true roots, stems, and leavesAnswer
  2. B
    The presence of true vascular tissues containing xylem and phloem
  3. C
    Extracellular digestion of organic matter through saprophytic nutrition
  4. D
    Conduction of water exclusively in a downward direction through the thallus

Answer

An undifferentiated plant body lacking true roots, stems, and leaves
Thallophytes represent the simplest group of plants, characterized by a plant body (thallus) that is completely undifferentiated into true roots, stems, or leaves.

Step-by-Step Solution

1
Analyze the plant body structure of Thallophytes
Thallophytes consist of a simple, undifferentiated vegetative body known as a thallus.
They lack specialized tissue organization into true roots, stems, or leaves.
2
Compare with Bryophytes and Pteridophytes
Bryophytes show simple body differentiation (stem-like and leaf-like structures), while Pteridophytes possess true roots, stems, and leaves.
This fundamental structural simplicity defines and distinguishes Thallophytes from higher cryptogams.

Key Concept

Plant body organization in Thallophytes
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Topics

Thallophytes, Bryophytes, and Pteridophytes

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