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Difficulty: MediumThallophytes, Bryophytes, and Pteridophytes

A biology student collected three unlabelled plant specimens representing Thallophyta, Bryophyta, and Pteridophyta. Upon analyzing their anatomical structures and physiological transport mechanisms, which statement correctly identifies a feature present ONLY in Pteridophyta among these three groups?

  1. The possession of true vascular tissues, consisting of xylem for water transport and phloem for translocating manufactured food.Answer
  2. B
    The presence of well-developed xylem and phloem within Bryophyta to supply water to their leafy gametophytes.
  3. C
    The arrangement where xylem translocates manufactured organic food downwards while phloem conducts soil water and minerals upwards.
  4. D
    The reliance of Thallophyta on extracellular saprophytic digestion to absorb organic matter due to an absence of photosynthetic pigments.

Answer

The possession of true vascular tissues, consisting of xylem for water transport and phloem for translocating manufactured food.
Pteridophytes (ferns and fern allies) are uniquely characterized among lower plant divisions by having specialized vascular tissues (xylem and phloem) for internal transport, making them vascular cryptogams.

Step-by-Step Solution

1
Analyze the structural characteristics of Thallophyta, Bryophyta, and Pteridophyta.
Thallophytes have simple, undifferentiated thalloid bodies without vascular tissues. Bryophytes possess simple stem-like/leaf-like structures but lack vascular tissues. Pteridophytes possess true stems, leaves, roots, and true vascular tissues (xylem and phloem).
Plant classification relies on body differentiation and the presence or absence of vascular tissues.
2
Evaluate transport mechanisms and tissue composition in Pteridophyta.
Pteridophytes are the first vascular plants (vascular cryptogams) where xylem moves water/minerals upward and phloem conducts manufactured sugars.
Vascular tissue evolution enabled pteridophytes to grow larger and adapt better to terrestrial life than thallophytes or bryophytes.

Key Concept

Vascular Tissue Differentiation in Lower Plants
Estimated Time:1m 0s
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Topics

Thallophytes, Bryophytes, and Pteridophytes

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