characteristics and economic importance of pteridophytes pdf

1. Feel free to … Conifer - Conifer - Economic importance: Conifers provide all the world’s softwood timber, the major construction wood of temperate regions, and about 45 percent of the world’s annual lumber production. 0000007648 00000 n Sporocarps of Marsilea, a water fern, yield starch that is cooked and eaten by certain tribal. 0000206418 00000 n 0000072062 00000 n Share Your PPT File. 0000010647 00000 n Instead, the water and minerals flow from the surface of the plant- cell to cell in the … Leaves can be microphyllous (small without forming leaf gaps in vascular … 8. 3. PTERIDOLOGY (PTERIDOPHYTES) Dear Biology Aspirants, Here you can find the Lecture Notes in Pteridoplogy (Pteridophytes). Which organelle is known as “power house” of the cell? plants with feather like leaves). Leaves can be microphyllous (small without forming leaf gaps in vascular supply of stem, e.g., Selaginella) or macrophyllous (megaphyllous or large forming leaf gaps in vascular supply of stem, e.g., most ferns). 7�J�aL����|�m�&�.d� a��c������,����_]i�8`P��֭��Ш.a�q�����'3�u�� Azolla (a water fern) has a symbiotic association with nitrogen fixing cyanobacterium Anabaena azollae. trailer It is usually independent. The innhabitants of dry land are Selaginella rupestris, Selaginella lepidophylla, Equisetum arvens etc. 0000160781 00000 n Ruhmora adiantiformis is called the florist’s fern; since their leaf resists wilting they … Sperms are bi or multi-flagellate. General characters of Pteridophytes. Answer Now and help others. What is an angiosperm? Ecological importance: The liverworts, mosses and lichens are supposed to be the pioneers in establishing vegetation where other vegetation seems to be practically impossible. Please click on the desired topic to access its contents. 5777 0 obj <> endobj To select a good EI, four sets of these criteria must be evaluated. Instead, sieve cells are present. Heteromorphic or heterologous alternation of generations is present in the life cycle. 0000006984 00000 n The main plant body is a sporophyte. OCCURENCE - Most of the pteridophytes are terrestrial and grow in moist and shady places - While some flourish well in open, dry places especially in xeric conditions (Selaginella lepidophylla). Gametophyte is small or inconspicuous. Name the types of nitrogenous bases present in the RNA. 1. Share Your PDF File Characters of Pteridophytes: They are characterised by the following features: 1. 0000205700 00000 n 6. The Pteridophytes are an economically important group of plants. Short classification of the ferns : Radosław Janusz Walkowiak. 0000015859 00000 n Pteridophytes (ferns and lycophytes) are free-sporing vascular plants that have a life cycle with alternating, free-living gametophyte and sporophyte phases that are independent at maturity. Privacy Policy3. They are characterised by the following features: 1. First, the economic and logistical suitability (including financial cost, time efficiency, and personnel requirements); followed by the analysis and interpretation efficiency (including the … This website includes study notes, research papers, essays, articles and other allied information submitted by visitors like YOU. 0000012626 00000 n (2 teaching hours) 2.7 Gymnosperm: General introduction and characteristic features of Gymnosperms; morphology and reproduction of Pinus. The different species of Selaginella are grown as the garden plants. Before sharing your knowledge on this site, please read the following pages: 1. In this article we will discuss about the Characters and Economic Importance of Pteridophytes. Classification of Pteridophytes. Some extend to sandy soils. 0000003755 00000 n h�b```b``+g`c`�db@ !�;���0%r������2�� �����������]�� 3Ysx{��:|=�9�������[��Y���ӣ Members of this group are most primitive living vascular plants. Antheridia are small and sessile. 0000008930 00000 n 0000011675 00000 n ; Pteridophytes shows large variation in the form, size and habit. They colonize the barren rocks and exposed areas of hills, and make them suitable for growing angiospermic and other […] The root system is always adventitious. Hence late Paleozoic can be regarded as “Age of Pteridophytes.” Tippo (1942) has placed them in Tracheophyta or Tracheata because these plants first developed vascular tissues (xylem and phloem) where the tracheary elements appear like human trachea. By their growth pteridophytes bind the soil even along hill slopes. 0000005625 00000 n Selaginella, Adiantum, Dryopteris, Equisetum (Horse-tail) Salvinia. These are also known as vascular cryptogams. Characteristics of Pteridophytes, Morphology of Pteridophytes, Reproduction of Pteridophytes, Homosporous and Heterosporous Pteridophytes, Megaspore and Microspores, Gametophytes of Pteridophytes, Fertilization, Zygote and Embryo of Pteridophytes, Life Cycle and Alternation of Generation.

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