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Topic: Angiosperm


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  Sexual Reproduction in Angiosperms
Angiosperms are the flowering plants (today the most abundant and diverse plants on earth).
In angiosperms, meiosis in the sporophyte generation produces two kinds of spores.
The food in the cotyledons is derived from the endosperm which, in turn, received it from the parent sporophyte.
users.rcn.com /jkimball.ma.ultranet/BiologyPages/A/Angiosperm.html   (1024 words)

  
  Angiosperm - MSN Encarta
The characteristic feature of angiosperms is the flower, the function of which is the reproduction of the plant through the development of seeds.
Angiosperms are divided into two classes, the Magnoliopsida and Liliopsida, popularly termed dicots and monocots, representing separate evolutionary lines that must have diverged early in the history of the group.
The direct predecessors of angiosperms are thought to have been woody gymnosperms; certain woody groups of dicots (see Magnolia) are thought to be primitive angiosperms.
encarta.msn.com /encyclopedia_761570423/Angiosperm.html   (616 words)

  
 Angiosperms
The angiosperms, or flowering plants, are one of the major groups of extant seed plants and arguably the most diverse major extant plant group on the planet, with at least 260,000 living species classified in 453 families (Judd et al., 2002; APG II, 2003; Soltis et al., 2005).
It is clear, however, that angiosperms do not fall into two major groups that correspond to monocots (Liliopsida) and dicots (Magnoliopsida) of most traditional classification systems such as Cronquist (1981), Takhtajan (1997), and their predecessors.
Utility of 17 chloroplast genes for inferring the phylogeny of the basal angiosperms.
tolweb.org /tree?group=Angiosperms&contgroup=Spermatopsida   (5241 words)

  
 Evolution: Angiosperm Origins and Evolution
Angiosperms are the most diverse group of the plant kingdom, comprising of about 250,000 species in 350 families (Kenrick, 1999).
The angiosperms as a whole were found to be monophyletic to the exclusion of the gymnosperms (Qiu et al., 1999; Soltis et al., 1999).
Doyle, J.A. and Donoghue, M.J. (1993) Phylogenies and angiosperm diversification.
www.geocities.com /we_evolve/Plants/angiosperm.html   (2501 words)

  
 Angiosperm - Search Results - MSN Encarta
Angiosperm (Latin angi-, “enclosed”; Greek sperma, “seed”), common name for the division or phylum comprising flowering plants, the dominant form...
There are two general types of trees, angiosperms and gymnosperms.
Angiosperms are flowering plants in which the ovule, or seed, is encased in a...
encarta.msn.com /Angiosperm.html   (110 words)

  
 Angiosperm Life Cycle
Angiosperms, literally "vessel seeds", are herbaceous or woody vascular plants producing flowers and fruits.
The embryo sac is an oval mass with seven cells and eight nuclei, and it lies in the center of the ovule.
The mature female gametophyte of the Angiosperm is called the ___________________________, and consists of __________ nuclei.
arnica.csustan.edu /boty1050/Lab/angiosperm_lc.htm   (848 words)

  
 Botany online: Supporting Tissues - Vascular Bundles - Angiosperm Wood
The structure of angiosperm wood is more inhomogenous and variable than that of gymnosperms.
Angiosperm wood in its typical structure is found almost only in dicots.
Just like the wood of gymnosperms, that of angiosperms is interspersed with numerous intercellular spaces, whose structure, development and content are, however, more variable.
www.biologie.uni-hamburg.de /b-online/e06/06h.htm   (2019 words)

  
 THE LIFE CYCLE OF AN ANGIOSPERM
In the angiosperm, the sporophyte tissue takes the "lions share" of the entire life cycle with respect to both time spent in that stage and the size and visibility of the sporophytic organs.
It is important to be able to relate the angiosperm life cycle to that of bryophytes, ferns, and conifers in terms of when and where meiosis and fertilization occurs and the relative amount of time spent in the haploid vs. the diploid state.
The details of fruit development vary among different angiosperms and the final form depends upon whether the ovary was superior or inferior and whether other tissues become involved in fruit formation (e.g.
www.science.siu.edu /landplants/Anthophyta/Angio.LC.html   (1269 words)

  
 Identifying the Basal Angiosperm Node in Chloroplast Genome Phylogenies: Sampling One's Way Out of the Felsenstein Zone ...
in the angiosperm phylogeny (Mathews and Donoghue 1999
lineages of extant angiosperms (Mathews and Donoghue 1999
The eudicots (tricolpates) comprise roughly 64% of angiosperm
mbe.oxfordjournals.org /cgi/content/full/22/10/1948   (6579 words)

  
 The Mysteries Of The First Appearance Of The Plant Kingdom's Angiosperms!!New Page 1
Angiosperms appear rather suddenly in the fossil record, with no obvious ancestors for a period of about 80 to 90 million years prior to their appearance.
Angiosperms found at the site were located in ephemeral habitats along streams, and were a minor component of the vegetation (Wing et al.
It suggests that the earliest angiosperms were understory trees and shrubs, and that the flower was NOT the key innovation for the rapid diversification of angiosperms.
www.thewisegardener.com /Angiosperms_mysteries_of_the_Cenozioc_Age.htm   (797 words)

  
 Deep Time Project   (Site not responding. Last check: 2007-11-07)
The angiosperms, or flowering plants, comprising over 250,000 species and approximately 400 families, are, by far, the largest clade of plants and represent the dominant group of land plants today.
The early branches of the angiosperms are Amborella (a shrub endemic to New Caledonia), the Nymphaeales (the water lilies), and the shrubs/lianas Illicium, Schisandra, Trimenia, and Austrobaileya.
Angiosperms are so numerous both in terms of extant groups and fossil taxa that it would be difficult to begin with an all-encompassing analysis.
www.flmnh.ufl.edu /deeptime/projectsummary.html   (8769 words)

  
 Oldest Angiosperms
Angiosperm taxonomy is going through a major revision in evolutionary hierarchy based on the falsification of old schemes by molecular data (e.g.
Because angiosperms have a propensity for evolving parasitic members, even in near basal branches of their phylogenetic tree, it should not be surprising that basal parasitic angiosperms could exist.
Ecophysiological shade adaptation in the basal angiosperm, Austrobaileya scandens (Austrobaileyaceae).
www.sunstar-solutions.com /sunstar/Balanophor/BalanoTrias.htm   (6216 words)

  
 A New Gnetophyte from the Late Carnian
The Gnetales are relatives of angiosperms and Bennettitales that underwent drastic floral reduction and aggregation in response to wind-pollination (Doyle and Donoghue, 1986a).
With the acceptance of gnetopsids as the closest living sister group to the angiosperms, a conflict arose between the traditional phyllosporous interpretation of the carpel and the stachyosporous explanation of the bracteole-bearing axes terminated by an ovule in gnetophytes (Stevenson, 1993; Doyle and Donoghue, 1992).
The angiosperm carpel can be either conduplicate with an extended suture or ascidiate with no suture in primitive living angiosperms; similarly, the loss of the suture in extant Gnetales is interpreted as an apomorphy, with no more or less significance than its closure in angiosperms.
bcornet.tripod.com /Cornet96/Archaestrobilus.htm   (10638 words)

  
 When Did Angiosperms First Evolve?
The pattern of angiosperm radiation is consistent with the pattern of anthophilous insect radiation and the pattern of appearance of derived floral characters and taxa specifically associated with the most advanced anthophilous insects.
Angiosperms are regarded as the sister group to the ancestors of the Gnetales, and therefore had to exist by the Late Triassic.
Fossil evidence for Sanmiguelia indicates that it is a basal crown-group angiosperm (Cornet, 1986; 1989b; see Sanmiguelia lewisii), implying that angiosperms first diversified in tropical areas of North America during the Late Triassic, but did not have dedicated pollinators that could accelerate their evolution as angiosperms had in the Cretaceous.
www.unifiedworlds.com /cornet/Why02/why.htm   (12355 words)

  
 Toward a new synthesis: Major evolutionary trends in the angiosperm fossil record -- Dilcher 97 (13): 7030 -- ...
The floral organs of all early angiosperms are radially symmetrical, a symmetry exhibited by all of the floral organs and
of the angiosperms and the radiation of the mammals and birds.
Coevolutionary events are largely responsible for the origin and subsequent nodes of evolution and radiation of the angiosperms.
www.pnas.org /cgi/content/full/97/13/7030   (3886 words)

  
 Biology Lab 8 71:125
Pollination in angiosperms is indirect in that pollen is deposited on the stigma of the carpel rather than directly on the ovule as is the situation in gymnosperms.
In many angiosperms the fruits are variously modified during development to facilitate a more effective means of seed dispersal.
Unlike Pine, growth of the pollen tube in angiosperms is fairly rapid.
www.umanitoba.ca /faculties/science/biological_sciences/lab8/biolab8_5.html   (818 words)

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