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：

pteridophyte    
n. 羊齿类

羊齿类

pteridophyte
n 1: plants having vascular tissue and reproducing by spores
[synonym: {pteridophyte}, {nonflowering plant}]


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


  • Pteridophyte - Wikipedia
    A pteridophyte is a vascular plant with xylem and phloem that reproduces by means of spores Because pteridophytes produce neither flowers nor seeds, they are sometimes referred to as "cryptogams", meaning that their means of reproduction is hidden
  • Pteridophyta - Definition, Characteristics, Classification, Uses
    The gametophyte of pteridophyte bears the male sex organ called the antheridia and the female sex organ called the archegonia Transferring the male gamete (antherozoids) to the female archegonia is achieved with the help of water
  • What Is Pteridophyta? Definition, Types, and Uses
    Pteridophyte sperm cells are multi-tailed and must physically swim to the egg, so a water film is essential for reproduction Seed plants solved this problem with pollen, which travels by wind or animals and doesn’t require standing water
  • Pteridophyta - Characteristics, Life Cycle, Classification, Examples . . .
    Ferns, horsetails, and lycophytes fall under the pteridophyte category Although these groups share similarities, they do not form a monophyletic group This means ferns and horsetails are more closely related to seed plants than they are to lycophytes
  • 6. 2: Pteridophyta - the Ferns - Biology LibreTexts
    Pteridophyta, ferns and allies, have approximately 12,000 species and six classes (Figure 6 2 1) They have a sporic life cycle with sporophyte predominance whereas their gametophytes are often reduced to prothallium, small hornwort-like plant Another frequent variant is the underground, mycoparasitic gametophyte Pteridophyta (with one exception) have true roots Most of them have vascular
  • Pteridophytes: Origin, Classification and Importance | Botany
    Has any Living Pteridophyte reached the Seed Habit? Of all the extant members Selaginella may be said to provide the closest approach to a seed habit It satisfies all the prerequisites of a seed habit These are: (a) It is heterosporous (b) The megaspore usually germinates within the megasporangium and is not shed for quite some time
  • What Are Pteridophytes? Characteristics, Life Cycle Types
    Discover how Pteridophytes (ferns and allies) became the first vascular plants Learn about their structure and complex spore-based life cycle
  • Pteridophytes - Live Plant Collections
    Ferns Horsetails Along with the club mosses, ferns and horsetails are part of a group called Pteridophytes This group includes all vascular plants that reproduce through spores, rather than seeds Ferns and horsetails stand apart from club mosses by their leaves While clubmosses have simple leaves with just one vein (called “microphylls”), ferns and horsetails have true, complex leaves
  • Pteridophytes - Biology Encyclopedia - plant, body, different, cycle . . .
    Some pteridophyte groups, including the club mosses and horsetails (classes Lycopodiopsida and Equisetopsida), have simple microphyllous leaves, featuring a single, unbranched vein and modest vascular supplies that do not cause breaks or gaps in the stem vasculature
  • Pteridophyte - an overview | ScienceDirect Topics
    According to a recent study, there are 16 pteridophyte species varieties native to Easter Island, of which 4 species and 1 variety are endemics (Meyer, 2013) Four of these species (one endemic) might be considered extinct, as they have not been observed or collected since more than 75 years ago





中文字典-英文字典  2005-2009