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Difficulty: EasyEvolutionary Trends in Plants and Animal Systems

In the evolutionary trend of terrestrial plants, which key adaptation distinguishes gymnosperms from pteridophytes by allowing successful fertilization without requiring environmental water?

  1. Production of airborne pollen tubes and naked seedsAnswer
  2. B
    Development of seeds completely enclosed inside protective fruits
  3. C
    First emergence of true vascular tissues such as xylem and phloem
  4. D
    Absence of specialized vascular tissue for conducting water

Answer

Production of airborne pollen tubes and naked seeds
Gymnosperms represent an important evolutionary milestone over pteridophytes because they developed pollen grains and pollen tubes to deliver male gametes to the egg, freeing them from dependence on standing water for fertilization and bearing naked seeds for survival.

Step-by-Step Solution

1
Analyze the reproductive limitations of pteridophytes.
Pteridophytes (ferns) possess vascular tissue but require a film of water for swimming flagellated sperm to reach the archegonium.
Water dependency restricts pteridophyte fertilization to moist habitats.
2
Identify the evolutionary advance in gymnosperms.
Gymnosperms evolved wind-pollinated pollen grains that grow pollen tubes directly into the ovule, producing naked seeds.
This adaptation allows gymnosperms to reproduce independently of liquid water on land.

Key Concept

Evolutionary transition from water-dependent fertilization in pteridophytes to pollen- and seed-based terrestrial reproduction in gymnosperms
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Evolutionary Trends in Plants and Animal Systems

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