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Difficulty: MediumThallophytes, Bryophytes, and Pteridophytes

Match each plant division with its defining anatomical and physiological characteristic.

  • ThallophytaSimple, undifferentiated body lacking true roots, stems, leaves, or vascular tissue
  • BryophytaAvascular terrestrial body anchored by rhizoids, with a dominant gametophyte stage
  • PteridophytaVascular plant possessing true roots, stems, and leaves with a dominant sporophyte stage

Answer

Thallophyta matches the description of a simple, undifferentiated body lacking true roots, stems, leaves, or vascular tissue; Bryophyta matches an avascular terrestrial body anchored by rhizoids, with a dominant gametophyte stage; Pteridophyta matches a vascular plant possessing true roots, stems, and leaves with a dominant sporophyte stage.
Thallophytes are defined by an unsegmented thallus lacking vascular tissue; Bryophytes are non-vascular cryptogams with a dominant gametophyte generation anchored by rhizoids; Pteridophytes are vascular cryptogams with true root, stem, and leaf structures dominated by the sporophyte generation.

Step-by-Step Solution

1
Analyze the features of Thallophyta.
Thallophytes (e.g., algae) exhibit no body differentiation into roots, stems, or leaves, and lack conductive vascular tissue.
This represents the simplest plant body plan (thallus).
2
Analyze the features of Bryophyta.
Bryophytes (e.g., mosses, liverworts) lack vascular tissues (xylem and phloem), use hair-like rhizoids for anchorage, and maintain a dominant haploid gametophyte phase.
They are non-vascular plants transitional between aquatic and terrestrial environments.
3
Analyze the features of Pteridophyta.
Pteridophytes (e.g., ferns) are vascular plants (containing xylem and phloem) with differentiated vegetative organs and a dominant diploid sporophyte generation.
They represent the earliest true vascular land plants.

Key Concept

Comparative anatomy and life cycle dominance in lower plant groups
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Topics

Thallophytes, Bryophytes, and Pteridophytes

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