Question
What is the advantage of development of seed habits in seed plants?
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Answer
Seed habit developed in extinct pteridosperms or Cycadofilicales. It is a group intermediate between cycads and ferns. The habit made the seed plants independent of the requirement of external sources of water at the time of fertilisation. In seedless vascular plants, the gametophyte must develop on moist soil with a thin sheet of water. The latter is required for the swimming of sperms for reaching the female sex organs. As a result, seedless vascular plants could never become true land plants. They were popularly called as amphibian of plant kingdom.
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