gnetales वाक्य
उदाहरण वाक्य
मोबाइल
- Most recent systems place the Welwitschiaceae in the gymnosperm order Gnetales.
- However, many other lines of evidence show that Gnetales is not related to angiosperms.
- The other extant groups are the 75-80 species of Gnetales and one species of Ginkgo.
- Most recent systems place " Welwitschia mirabilis " in its own family Welwitschiaceae in the gymnosperm order Gnetales.
- Genetic analyses indicate that the Gnetales arose from within the conifer group, and any morphological similarities between angiosperms and Gnetales have evolved separately.
- Genetic analyses indicate that the Gnetales arose from within the conifer group, and any morphological similarities between angiosperms and Gnetales have evolved separately.
- Colorful and / or pungent structures surround the cones of plants such as cycads and Gnetales, making a strict definition of the term " flower " elusive.
- ""'Drewria potomacensis " "'is a Cretaceous megafossil member of the Gnetales, from the Potomac Group, hence its name.
- "' Welwitschiaceae "'is a family of plants of the order Gnetales with one living species, " Welwitschia mirabilis ", found in southwestern Africa.
- The ancestors of the extant gymnosperm orders Gnetales, Coniferales, Cycadales and Ginkgoales arose during the Late Paleozoic, and became the dominant component of the Late Permian and Mesozoic flora.
- The gymnosperms include conifers, cycads, gnetales and ginkgos and these may have appeared as a result of a whole genome duplication event which took place about 319 million years ago.
- They are thought to have pollinated such plants as Caytoniaceae, Cheirolepidiaceae, Czekanowskiaceae, Pentoxylaceae, and Gnetales, as their ovulate organs are either poorly suited for wind pollination or have structures that could support long-proboscid fluid feeding.
- Some more recent studies have used the word anthophyte to describe a group which includes the angiosperms and a variety of fossils ( glossopterids, " Pentoxylon ", Bennettitales, and " Caytonia " ), but not the Gnetales.
- It was once thought that vessel elements were an evolutionary innovation of flowering plants, but their absence from some basal angiosperms and their presence in some members of the Gnetales suggest that this hypothesis must be re-examined; vessel elements in Gnetales may not be homologous with those of angiosperms, or vessel elements that originated in a precursor to the angiosperms may have been subsequently lost in some basal lineages ( e . g ., Amborellaceae, Tetracentraceae, Trochodendraceae, and Winteraceae ), described by Arthur Cronquist as " primitively vesselless ".
- It was once thought that vessel elements were an evolutionary innovation of flowering plants, but their absence from some basal angiosperms and their presence in some members of the Gnetales suggest that this hypothesis must be re-examined; vessel elements in Gnetales may not be homologous with those of angiosperms, or vessel elements that originated in a precursor to the angiosperms may have been subsequently lost in some basal lineages ( e . g ., Amborellaceae, Tetracentraceae, Trochodendraceae, and Winteraceae ), described by Arthur Cronquist as " primitively vesselless ".
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