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Difficulty: MediumSpermatophytes: Gymnosperms and Angiosperms

A botanist collects a vascular seed plant and observes that its xylem tissue consists entirely of tracheids without vessel elements, while its reproductive structures are organized into cones. Which of the following characteristics is also expected in this plant?

  1. Seeds exposed directly on the surface of specialized scale-like structuresAnswer
  2. B
    Seeds completely enclosed within a fruit wall derived from a mature ovary
  3. C
    Phloem tissue that conducts water and inorganic mineral salts upward from roots
  4. D
    Binomial species designation formatted as pinus Caribaea

Answer

Seeds exposed directly on the surface of specialized scale-like structures
The presence of xylem composed purely of tracheids alongside cone-based reproduction identifies the plant as a gymnosperm. Gymnosperms are characterized by having naked seeds that are exposed on the surfaces of scales or bracts, rather than being enclosed within ovary walls.

Step-by-Step Solution

1
Identify the taxonomic group described in the stem.
Wood lacking vessel elements (possessing only tracheids) combined with cone-bearing reproductive structures uniquely characterizes gymnosperms.
Gymnosperms are non-flowering seed plants with primitive xylem elements (tracheids).
2
Evaluate the seed structure characteristic of gymnosperms.
Gymnosperm seeds develop exposed on megasporophylls (ovuliferous cone scales) rather than enclosed inside ovaries.
The term 'gymnosperm' literally means 'naked seed'.

Key Concept

Structural and anatomical characteristics of Gymnosperms
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Topics

Spermatophytes: Gymnosperms and Angiosperms

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