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Difficulty: HardEvolutionary Trends in Plants and Animal Systems

An evolutionary survey of plant and animal body systems demonstrates structural and functional transitions from primitive diffusion-based forms to highly complex organs. Which of the following statements correctly identifies a true evolutionary milestone in organ system development?

  1. Pteridophytes developed true vascular tissue consisting of xylem and phloem for long-distance transport, representing an evolutionary milestone over non-vascular bryophytes.Answer
  2. B
    Bryophytes evolved true xylem vessels and tracheids to facilitate tall erect growth and efficient water movement in dry terrestrial habitats.
  3. C
    Amphibians were the first vertebrate class to achieve complete separation of oxygenated and deoxygenated blood through a four-chambered heart.
  4. D
    Insects utilize metanephridia as their primary excretory organs to filter coelomic fluid directly into the circulatory system.

Answer

Pteridophytes developed true vascular tissue consisting of xylem and phloem for long-distance transport, representing an evolutionary milestone over non-vascular bryophytes.
The statement identifying pteridophytes as developing true vascular tissue (xylem and phloem) correctly highlights a major evolutionary milestone in plants. This structural adaptation enabled efficient internal translocation of water, minerals, and photoassimilates, allowing plants to conquer land and grow significantly larger than non-vascular bryophytes.

Step-by-Step Solution

1
Analyze plant evolutionary trends regarding internal transport systems.
Bryophytes (mosses) are non-vascular plants reliant on simple diffusion, whereas Pteridophytes (ferns) represent the first vascular plants with true xylem and phloem.
Vascular tissue development is the primary anatomical milestone separating seedless vascular plants from bryophytes.
2
Evaluate vertebrate circulatory system trends.
Fish have a 2-chambered heart, amphibians and most reptiles have a 3-chambered heart, and birds/mammals have a 4-chambered heart.
Complete double circulation with a 4-chambered heart evolved in homoiothermic vertebrates, not amphibians.
3
Evaluate invertebrate excretory system mappings.
Annelids possess nephridia/metanephridia, whereas insects (Arthropoda) possess Malpighian tubules.
Matching specific excretory structures to their respective phyla confirms that insects do not use metanephridia.

Key Concept

Evolutionary transitions in plant vascular systems and animal organ complexity
Estimated Time:1m 30s
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Topics

Evolutionary Trends in Plants and Animal Systems

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