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Difficulty: EasySpermatophytes: Gymnosperms and Angiosperms

Which of the following characteristics distinguishes gymnosperms from angiosperms?

  1. Possession of exposed seeds that are not enclosed within an ovary wallAnswer
  2. B
    Production of seeds enclosed entirely within a true fruit structure
  3. C
    Complete absence of specialized vascular tissues for transport
  4. D
    Conduction of organic food materials exclusively through xylem vessels

Answer

Possession of exposed seeds that are not enclosed within an ovary wall
Gymnosperms produce exposed or 'naked' seeds borne on cone scales because they lack carpels and ovaries to enclose their seeds, whereas angiosperms enclose their seeds within ovaries that develop into fruits.

Step-by-Step Solution

1
Identify the two main sub-groups of seed-bearing plants (spermatophytes).
Spermatophytes are divided into gymnosperms and angiosperms.
Both groups produce seeds, but differ fundamentally in how their seeds develop and are protected.
2
Compare the seed structures of gymnosperms and angiosperms.
Gymnosperms bear 'naked' seeds on megasporophylls (cones), whereas angiosperms bear seeds enclosed within carpels (ovaries) that mature into fruits.
The absence of an enclosed ovary wall in gymnosperms is the primary diagnostic feature separating the two groups.

Key Concept

Seed enclosure distinction between Gymnosperms and Angiosperms
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Topics

Spermatophytes: Gymnosperms and Angiosperms

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