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• monospores develop in sporangia. • polyspores are formed in larger number in the sporangium. 12. In algae: Reproduction and life histories …red algae, as exemplified by Polysiphonia, have some of the most complex life cycles known for living organisms.Following meiosis, four haploid tetraspores are produced, which germinate to produce either a male or a female gametophyte. Growth and reproduction of Polysiphonia denudata 151 trasts with that of P. boldii in which occasional hermaphroditic specimens were observed (Edwards, 1970a).
asexual - binary fission; sexual- conjugation. physarum reproduction. sexual - fruiting bodies. 1999-04-01 Polysiphonia brodiei (Dillwyn) Spreng.
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This sexual reproduction method is also found in some higher plants and animals too. Example: Chlamydomonas , Oedogonium , Chara , Polysiphonia , Porphyra etc. (iv).
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Following meiosis, four haploid tetraspores are produced, which germinate to produce either a male or a female gametophyte. Reproduction Polysiphonia shows an isomorphic alternation of generation. Both gametophytic (haploid) and sporophytic (diploid) generations are identical.
81B) stalked, subspherical to slightly urceolate, 150–300 µm in diameter; pericarp ostiolate, 2 cells thick, outer cells elongate, L/D 1.5–2 when mature. Jul 14, 2017 - Polysiphonia General Characteristics: Thallus Organization, Siphon System, Sexual Reproduction, Post Fertilization Changes and Life Cycle of Polysiphonia (Red Algae)
week 6: Life form, structure and reproduction in Ectocarpus and Polysiphonia. PREV. NEXT . Course Material. week 1: Lifeform, structure, reproduction and economic significance of Viruses (RNA and DNA types) with special reference to TMV
Male and female reproduction in Polysiphonia stricta.
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On a fertile side-trichoblast spermatangia develop which eventually give rise to spermatia (male gametes). Polysiphonia is a heterotrichous alga having an erect series of branches and a filamentous prostrate section attached to the substratum by means of unicellular rhizoids. The ends of the rhizoids are flattened into lobed discs called haptera, which assist the penetration of the host tissue ( Polysiphonia parasitic form) or confirm attachment to substrata. Reproduction.
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The life-cycle of the red algae has three stages . In Polysiphonia it consists of a sequence of a gametangial, carpospoangial and tetrasporangial phases. In life cycle of Polysiphonia both asexual and sexual reproduction takes place.