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Zorluk: OrtaMorphological and Physiological Adaptations to Environments

Submersed hydrophytes growing completely under water typically exhibit poorly developed xylem vessels and lack stomata on their leaf surfaces. Which of the following statements explains why xylem tissue is greatly reduced in these aquatic plants?

  1. Surrounding water provides physical support and allows direct absorption across the entire body surface, minimizing the need for specialized water-conducting vessels.Cevap
  2. B
    Phloem vessels replace xylem by conducting water and mineral salts unidirectionally from roots to shoot tips.
  3. C
    Aquatic environments lack vascular requirements because submersed plants are phylogenetically classified as non-vascular bryophytes.
  4. D
    Xylem vessels degenerate because individual plants stop using them in response to aquatic immersion during their lifetime.

Cevap

Surrounding water provides physical support and allows direct absorption across the entire body surface, minimizing the need for specialized water-conducting vessels.
In submersed aquatic environments, water surrounds all plant tissues, allowing direct absorption of water and minerals across thin leaf cuticles. Furthermore, water buoyancy provides mechanical support, eliminating the requirement for lignified xylem vessels typical of terrestrial plants.

Adım Adım Çözüm

1
Identify the environmental pressures acting on submersed hydrophytes.
Submersed plants live entirely submerged in freshwater habitats where water availability is abundant and buoyancy provides support.
Environmental conditions determine morphological adaptations.
2
Analyze the primary biological functions of xylem tissue in terrestrial plants.
In terrestrial plants, xylem functions in structural support against gravity and long-distance transport of water against transpiration pull.
Understanding xylem function highlights why it is needed on land.
3
Evaluate how submersed aquatic conditions alter these functional requirements.
Water buoyancy replaces the need for mechanical support, and nutrients/water are absorbed directly through thin epidermal surfaces, making extensive xylem transport unnecessary.
Adaptations reflect reduced structural and transport demands in water.

Anahtar Kavram

Morphological Adaptations of Hydrophytes
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Konular

Morphological and Physiological Adaptations to Environments

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