英文字典中文字典


英文字典中文字典51ZiDian.com



中文字典辞典   英文字典 a   b   c   d   e   f   g   h   i   j   k   l   m   n   o   p   q   r   s   t   u   v   w   x   y   z       







请输入英文单字,中文词皆可:

Spermatophyta    
种子植物门

种子植物门

Spermatophyta
n 1: 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 (spore producing plants lacking
vascular tissue and roots) [synonym: {Spermatophyta}, {division
Spermatophyta}]

Spermatophyta \Sper`ma*toph"y*ta\, n. pl. [NL.; spermato- Gr.
? plant.] (Bot.)
A phylum embracing the highest plants, or those that produce
seeds; the seed plants, or flowering plants. They form the
most numerous group, including over 120,000 species. In
general, the group is characterized by the marked development
of the sporophyte, with great differentiation of its parts
(root, stem, leaves, flowers, etc.); by the extreme reduction
of the gametophyte; and by the development of seeds. 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.

Note: The phrase "flowering plants" is less distinctive than
"seed plants," since the conifers, grasses, sedges,
oaks, etc., do not produce flowers in the popular
sense. For this reason the terms {Anthrophyta},
{Phaenogamia}, and {Panerogamia} have been superseded
as names of the phylum by Spermatophyta.
[Webster 1913 Suppl.]


请选择你想看的字典辞典:
单词字典翻译
Spermatophyta查看 Spermatophyta 在百度字典中的解释百度英翻中〔查看〕
Spermatophyta查看 Spermatophyta 在Google字典中的解释Google英翻中〔查看〕
Spermatophyta查看 Spermatophyta 在Yahoo字典中的解释Yahoo英翻中〔查看〕





安装中文字典英文字典查询工具!


中文字典英文字典工具:
选择颜色:
输入中英文单字

































































英文字典中文字典相关资料:







中文字典-英文字典  2005-2009