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Difficulty: MediumThallophytes, Bryophytes, and Pteridophytes

Arrange the following plant representatives in order of increasing anatomical complexity and tissue differentiation, starting from the simplest body structure to the most complex.

  1. 1Spirogyra
  2. 2Funaria (Moss)
  3. 3Dryopteris (Fern)

Answer

The correct sequence from simplest to most complex anatomical differentiation is Spirogyra, followed by Funaria, and ending with Dryopteris.
In plant evolution, structural complexity increases from thallophytes to pteridophytes. Spirogyra (a thallophyte) has an undifferentiated body without true organs or conducting tissues. Funaria (a bryophyte) exhibits primitive differentiation into stem-like and leaf-like structures anchored by rhizoids, but lacks true vascular tissue. Dryopteris (a pteridophyte) represents the highest structural complexity among the three, featuring true roots, underground stems (rhizomes), leaves (fronds), and vascular tissue for internal transport.

Step-by-Step Solution

1
Classify each organism into its main plant division.
Spirogyra belongs to Thallophyta, Funaria belongs to Bryophyta, and Dryopteris belongs to Pteridophyta.
Taxonomic classification groups reflect evolutionary levels of body differentiation.
2
Evaluate the structural features and tissue complexity of each plant division.
Thallophytes have an unspecialized body (thallus). Bryophytes have primitive stem-like and leaf-like organs with rhizoids but no vascular system. Pteridophytes possess true vegetative organs and a complete vascular system.
Plant evolution demonstrates a progression from non-vascular thalloid organisms to vascular land plants.
3
Arrange the organisms according to increasing anatomical complexity.
Spirogyra (Thallophyte) → Funaria (Bryophyte) → Dryopteris (Pteridophyte).
This places non-differentiated algae first, non-vascular mosses second, and vascular ferns last.

Key Concept

Evolutionary progression of body differentiation and vascularization in non-seed plants.
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Topics

Thallophytes, Bryophytes, and Pteridophytes

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