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Angiosperms

'angiosperms'

[media:Any [[member of the more than 250,000 Species of flowering plants (division magnoliophyta) having roots, stems, leaves, and well-developed conductive tissues (xylem and phloem). Angiosperms are often differentiated from gymnosperms by their production of seeds within a closed chamber (the ovary). Example: Aplle trees and all fruit trees. The ovary wall is actually the fruit. The magnoliophyta division is composed of two classes, the monocotyledons (liliopsida) and dicotyledons (magnoliopsida).

]]]

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Re: New perspectives in theory of evolution

... Simple plants and phinophyta include above 150 thousands specieses, angiosperms above 250 t. specieses, fungi 1,5 mln, insects about 1 mln, primitive animals tens thousands, fishes 24,5 t., reptiles 13 t., birds 9350, ...

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by InsertFn
Mon May 18, 2009 8:37 pm
 
Forum: Evolution
Topic: New perspectives in theory of evolution
Replies: 4
Views: 408

Alternation of generation

alternation of generation is only in pteridophytes(seedless).Spermatophytes(gymnosperms and angiosperms) don't exibit alternation of generation

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by asker94
Sat May 02, 2009 8:09 am
 
Forum: Botany Discussion
Topic: Alternation of generation
Replies: 6
Views: 1761

alternation of generations in mosses/ferns (haploid/diploid)

... is the sporophyte. In higher plants (gimnosperms and above) the gametophyte is reduced to just a few cells inside the seed (in the male seed of angiosperms the prothallus is just one cell if i remember correctly). Does that help?

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by MrMistery
Wed Apr 22, 2009 1:54 pm
 
Forum: Botany Discussion
Topic: alternation of generations in mosses/ferns (haploid/diploid)
Replies: 2
Views: 383

Re: Alternation of generation

Yes, angiosperms go through the alternation of generations. The primary stage is the sporophyte with an incredibly small, nutritionally dependent gametophyte stage that is located in the flower. Check out this link for a full ...

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by sagda
Thu Jan 29, 2009 5:10 pm
 
Forum: Botany Discussion
Topic: Alternation of generation
Replies: 6
Views: 1761

Re: Alternation of generation

Yes, angiosperms go through the alternation of generations. The primary stage is the sporophyte with an incredibly small, nutritionally dependent gametophyte stage that is located in the flower. Check out this link for a full ...

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by plasmodesmata11
Mon Jan 26, 2009 11:04 pm
 
Forum: Botany Discussion
Topic: Alternation of generation
Replies: 6
Views: 1761
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