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The meristematic area—the region of new cell growth—that produces them may continue its activities over a number of weeks, producing sporangia of all ages, older ones being pushed aside as new ones mature in their turn. MUIlTIPLE CHOICE QUESTIONS OF PTERIDOPHYTA, 1. ADVERTISEMENTS: In this article we will discuss about:- 1. This spoi ophyte is an independent plant. The two types of sporangia are (1) Eusporangium and (2) Leptosporangium. (7) Reproduction: The sex organs are multicellular enclosed in a jacket of cells. In certain pteridophytes the sporangia are produced within specialized structure, the sporocarps (e.g., Marsilea, Salvinia, and Azolla). SPOROPHYLLS -The leaves that bear sporangia are known as sporophylls. The sporophyte performs vegetative reproduction and asexual reproduction. ... forked and subtending a 3-lobed sporangium in Psilotaceae. Please enable Cookies and reload the page. Reproduction in Pteridophytes. The spores are produced by the sporangia in the spore mother cells. Question 2. The sporophyte of Pteridophyta possesses well-developed vascular tissue consisting of both xylem and phloem. A sporangium (pl., sporangia ) (modern Latin, from Greek σπόρος (sporos) ‘spore’ + ἀγγεῖον (angeion) ‘vessel’) is an enclosure in which spores are formed. Enter your e-mail address, Difference between Leptosporangium and Eusporangium (Comparison Table). This classification is proposed by Goebel in 1881 based on the developmental pattern of sporangia. Sporogenous tissue divides meiotically to form haploid spores. Stout aerial branches bear large conspicuous sporangia (Fig. In the plant evolution, there was a high need for heterospory because it independently arose in several groups of pteridophytes and even among mosses. • In some pteridophytes the sporangia develop on stems (i.e., cauline in origin) while in other they are borne either on the leaves (foliar) or in the axils of the leaves. 11. Instead, the water and minerals flow from the surface of the plant- cell to cell in the … Another way to prevent getting this page in the future is to use Privacy Pass. Pteridophytes occupy a transitional position between bryophytes and spermatophytes. You may need to download version 2.0 now from the Chrome Web Store. Pteridophytes are found in cool, damp and shady places and flourish well in sandy soil conditions. Here, the dominant sporophyte produces spores through meiosis. The pteridophytes were not necessarily the first vascular land plants (see Kenrick and Crane 1997). In certain pteridophytes the sporangia are produced within specialized structure, the sporocarps (e.g., Marsilea, Salvinia, and Azolla). Most of the pteridophytes are homosporous; their gametophytes are exosporic. And among the first of the plants to truly live on land were the Pteridophytes. In some pteridophytes like Marsilea, the sporangia are developed in a specialized structure called the sporocarp . 7.1 A). Introduction to Pteridophytes: Pteridophytes constitute a significant and important group in the plant kingdom. Introduction to Pteridophytes 2. The gametophyte generation forms gametes by mitosis. 229 phylls and the sporophylls. Spores on germination produce monoecious gametophyte. Spores are produced via meiosis inside the sporangia. Pteridophytes show a true alternation of generations. Origin of pteridophytes from an intermediate ancestral group. All plants, fungi, and many other lineages form sporangia at some point in their life cycle. The haploid spores on germination give rise to certain special, small, very ... Sporangia are located at the margins and tip of leaves on the ventral side of leaves. Gametophytic Generation 5. If two types of spores are present in a single plant species then it is known as the heterosporous pteridophytes. The sporophytes bear sporangia that are subtended by leaf-like appendages called sporophylls. The two types of sporangia are (1) Eusporangium and (2) Leptosporangium. Cloudflare Ray ID: 62ba12de9bc00828 Pteridophytes . This genus was divided by Spring1 according to the distribution of the sporangia, an arrangement which is main- They don’t have conducting tissues for transportation of water and minerals. Some other sporangia bear microspore and so the sporangium is known as the microsporangium which is again borne on the megasporophyll. The pteridophytes are found in cool, damp, shady places though some may flourish well in sandy ­soil conditions. Sexuality 9. The leaves which bear the sporangia are called: (a) sporophyl Is (b) Bract (c) Cone (d) Strobilus • If you are on a personal connection, like at home, you can run an anti-virus scan on your device to make sure it is not infected with malware. The vegetative plant body is a sporophyte in Pteridophytes. Performance & security by Cloudflare, Please complete the security check to access. 1. The Spores upon germination, give rise to a multicellular gametophyte called prothallus. in this article we will discuss about the modes of reproduction in psilotum with the help of diagrams. The sporangium in all pteridophytes is initiated by the laying down of a cross-wall in a superficial cell or a group of cells. All pteridophytes have a true alternation of generations, in which a dominant sporophyte generation produces spores through meiosis, and a free-living gametophyte generation forms gametes (egg and sperm) by mitosis. 10. Vegetative reproduction takes place by vegetative buds that develop on the rhizome or by fragmentation of rhizome. Heterosporous condition was developed from Pteridophytes. Classification of Pteridophytes Pteridophytes constitute a significant and important group in the plant kingdoms ... Sporangia always bearing the same type of spores i.e., they are homosporous 9. Pteridophytes [introduction, authors and addresses, systematic list, glossary, and key to tribes]. It can be composed of a single cell or can be multicellular. 6. Sporangium Definition. The gametophyte is known only in Psilotum and Tmesipteris (living genera) Sporophytic plant body develops sporangia in which sporogenous tissue is formed. In pteridophytes, the main plant body is a sporophyte, which is differentiated into true root, stem and leaves. Fern - Fern - The sorus: Hand in hand with the reduction in size of single sporangia are seen more and more complex aggregations of sporangia known as sori. In the context of evolution, pteridophytes fall between bryophytes and seed plants and share many characteristics with both of these groups. In this article we will discuss about the process of reproduction in selaginella with the help of diagram. Eichler (1883) regarded cryptogamae as a sub-division of the Plant Kingdom which included ‘Club mosses’, ‘Horse-tails’, and ‘ferns’. Another theory proposed. Majority of the Pteridophytes are homosporous e.g., Lycopodium, Pteris etc. Economic Importance 8. …number of spores produced per sporangium ranges from 16 or 32 in some pteridophytes to more than 65 million in some mosses. Eusporangia vs Leptosporangia (Similarities and Differences between Leptosporangia and Eusporangia of Pteridophytes) Sporangia are the specialized spore producing structures found in plants. The sporangium in all pteridophytes is initiated by the laying down of a cross-wall in a superficial cell or a group of cells. Sporangia bearing leaves are known as sporophylls.In heterosporous pteridophytes,sporophylls are of two types microsporophylls and megasporophylls.The sporophylls are specialised and localised to forms a compact structure known as strobilus or cone. A sporangium (plural: sporangia) is the capsule structure belonging to many plants and fungi, in which the reproductive spores are produced and stored.. All land plants undergo an alteration of generations to reproduce; the sporangium is borne upon the sporophyte, which is the asexual second generation structure.. The vascular tissue is confined to the central region of the stem forming: (a) Bundles (b) stele (c) Cortex (d) Pcricycle 2. Learn about Pteridophytes topic of Biology in details explained by subject experts on vedantu.com. Sporophyte is differentiated into stem, leaves and roots. Heterospory and Seed Habit 7. Linnaeus (1754) included them in the Class Cryptogamae (kruptos = hidden, gamos = marriage). Give a comparative account of the following: (a) Marchantia and Marsilea (b) Cycas and rose Answer: (a) Marchantia is a Bryophyte whereas Marsilea is a Pteridophyte. Two types of sporangia (larger ones megasporangia and smaller ones microsporangia) containing larger and smaller spores are borne on sporophylls which form cones terminally either on the stem or branches. In Pteridophytes, two types of sporangia are present. In Pteridophytes, two types of sporangia are present. He said that from Anthoceros to Pteridophytes.

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