logging in or signing up bryophyta&TERIDOPHYTA ajoysingh Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Copy Does not support media & animations WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 33 Category: Education License: All Rights Reserved Like it (0) Dislike it (0) Added: December 23, 2012 This Presentation is Public Favorites: 0 Presentation Description No description available. Comments Posting comment... Premium member Presentation Transcript PowerPoint Presentation: INTRODUCTION LIFE HISTORY OF BRYOPHYTA 1. Characteristics of Bryophytes. 2. Life cycle of Bryophyte. 3. Division into: (a) Liverworts (b) MossesPowerPoint Presentation: They are non-flowering plants. They grow in moist places. They are autotrophic. They do not have any vascular tissue because their body is so thin that tissue can directly collect the water through their body. BRYOPHYTESPowerPoint Presentation: They are land plants but the require water to complete sexual reproduction. so they are known as amphibious plants. They have got leaf like structures green in colour . They have also root like structure called rhizoids .They show clear cut Alternation of generation in their life cycle.PowerPoint Presentation: Main plant body of the bryophyte is haploid. It produce gametes ,hence is called gametophyte. Sex organs in bryophytes are multicellular. The male sex organ is called antheridium. They produce biflagellate antherozoids. The female sex organ called archegonium is flask shaped and produces a single egg.PowerPoint Presentation: The antherozoids are released into water where they come in contact with archegonium .An antherozoids fuses with the egg to produce the zygote. Zygotes do not undergo reduction division immediately. They produce a multicellular body called sporophyte. Some cells of the sporophyte undergo reduction division to produce haploid spores. These spores germinate to produce gametophyte.PowerPoint Presentation: Life cycle of BryophyteMosses are one group of bryophytes: Mosses are one group of bryophytesPowerPoint Presentation: The liverworts grow usually in moist, shady habitats such as banks of streams ,marshy ground, damp soil, bark of trees and deep in the woods. Plant body is thalloid. e.g Marchantia. The leafy members have tiny leaf like appendages in two rows on the stem like structure. Asexual reproduction in liverworts takes place by fragmentation of thalli, or by the formation of specialized structures called gemmae. LiverwortsPowerPoint Presentation: MARCHANTIA HEPATICA NOBILIS Liverwort`s ImagesPowerPoint Presentation: Adult gametophyte which appears from protonema is differentiated into Rhizoids Axis or stem ,Phylloid or leaves. At the base of stem ,branched, obliqely septate, multicellular colourless rhizoids are present. Mature rhizoids turn brown. Stem is erect and branches only once in extraaxillary fashion MOSSESPowerPoint Presentation: Stem is covered with small ,simple, sessile leaves which are arranged in a spiral fashion. Leaf is green , ovtate in shape with acute apex .It has a distinct mid-rib .Margin is slightly serrated. Main branch in young gametophore behaves as male shoot and side branch as female shoot.PowerPoint Presentation: Antheridia and archegonia are borne at the apices of branches. Antheridia are surrounded by perigonial leaves and archegonia with perichaetial leaves. The plants are autoecious and monoecious.PowerPoint Presentation: Life cycle of mossPowerPoint Presentation: Picture of moss plantPowerPoint Presentation: The pteridophytes include horsetails and ferns . These organs posses well-differentiated vascular tissues. They are found in cool, damp, shady places though some may flourish well in sandy- soil conditions. The main plant body is sporophyte which is differentiated into true root,stem, leaves. PTERIDOPHYTESPowerPoint Presentation: The leaves in pteridophyta are small (microphylls) as in selaginella or large (macrophylls) as in ferns.PowerPoint Presentation: Characteristics of Pteridophyta 1.Diploid sporophyte generation is predominant. 2.Sporophyte plant body has true roots, stem and leaves with well developed vascular system. 3.Asexual reproduction takes place by spores. 4.Most pteridophytes are homosporous; only a few show heterospory. 5.Spores are produced in multicellular sporangia after meiosis in spore mother cells.PowerPoint Presentation: 6.Gametophyte is haploid, multicellular, green and an independent structure. 7.Sex organs, antheridia and archegonia are multicellular. 8.Antherozoids (sperms) are spirally coiled and multi flagellate. 9.Opening of sex organs and transfer of male gametes to archegonium for fertilization are dependent on water. Further, fertilization takes place inside the archegonium.Life cycle of fern: Life cycle of fernPowerPoint Presentation: FernsPowerPoint Presentation: The End You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.