Английский Язык - Английский Язык
Определение spermatophyta в Английский Язык Английский Язык словарь
- They form the most numerous group, including over 120,000 species
- seed plants; comprises the Angiospermae (or Magnoliophyta) and Gymnospermae (or Gymnospermophyta); in some classification systems Spermatophyta is coordinate with Pteridophyta (spore producing plants having vascular tissue and roots) and Bryophyta (sporeproducing plants lacking vascular tissue and roots)
- by the extreme reduction of the gametophyte; and by the development of seeds
- A phylum embracing the highest plants, or those that produce seeds; the seed plants, or flowering plants
- All the Spermatophyta are heterosporous; fertilization of the egg cell is either through a pollen tube emitted by the microspore or (in a few gymnosperms) by spermatozoids
- In general, the group is characterized by the marked development of the sporophyte, with great differentiation of its parts root, stem, leaves, flowers, etc