|Copyright: rajan rajwade (Mrajan)
|Date Taken: 2009-05-31|
|Categories: Rain Forest|
|More Photo Info: [view]|
|Photo Version: Original Version|
|Date Submitted: 2010-01-17 8:20|
|[Note Guidelines] Photographer's Note|
|Previously i had posted the same but was having problem of size. Right now with appropriate size i am reposting this image.|
A fern is any one of a group of about 20,000 species of plants. Unlike mosses they have xylem and phloem (making them vascular plants). They have stems, leaves, and roots like other vascular plants. Ferns do not have either seeds or flowers (they reproduce via spores).
Ferns are not of major economic importance, but some are grown or gathered for food, as ornamental plants, or for remediating contaminated soils. Some are significant weeds. They also feature in mythology, medicine, and art.
Ferns are vascular plants differing from the more primitive lycophytes by having true leaves (megaphylls). They differ from seed plants (gymnosperms and angiosperms) in their mode of reproductionólacking flowers and seeds. Like all other vascular plants, they have a life cycle referred to as alternation of generations, characterized by a diploid sporophytic and a haploid gametophytic phase. Unlike the gymnosperms and angiosperms, the ferns' gametophyte is a free-living organism.
Life cycle of a typical fern:
A sporophyte (diploid) phase produces haploid spores by meiosis.
A spore grows by mitosis into a gametophyte, which typically consists of a photosynthetic prothallus.
The gametophyte produces gametes (often both sperm and eggs on the same prothallus) by mitosis.
A mobile, flagellate sperm fertilizes an egg that remains attached to the prothallus.
The fertilized egg is now a diploid zygote and grows by mitosis into a sporophyte (the typical "fern" plant).
(With the help of wikipedia)
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nice contrasty fern, TFS Ori