It is a sessile structure and develops at the terminal ends of the branches and its length varies from 1/4th of an inch to 2-3 inches in different species. 5)Q=10 11. Evolutionarily, they are the first terrestrial plants to possess vascular tissues – xylem and phloem. Ferns live in moist, cool and shady places. Because of this specific restricted requirement and the need for water for fertilisation, the spread of living pteridophytes is limited and restricted to narrow geographical regions. Some branches act as adventitious branches, which get separated from the plant and give rise to new Selaginella plants, e.g., in S.rupestris. The pteridophytes occupy an intermediate place between bryophytes and spermatophytes. (a) Plant body is differentiated into root, stem and leaves. Related posts: Short essay on Reproduction of Gymnosperms Short notes on Resemblances of Gymnosperms with Pteridophytes 15 Important Characteristics of Gymnosperms Important questions on Phanerogans: Gymnosperms … Salient Features of Federal Budget 2020-21 The net revenue receipts for 2020-21 have been estimated at Rs. (b) Leaves small (i.e., microphyllous) with a single unbranched vein. The Cryptogamia was further divided into Thallophyta. A saprophyte is the main plant body here. This event is a precursor to the seed habit considered an important step in evolution. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Science of plants – Botany: Origin, Development, Scope of Botany and Branches of Botany. (d) Sporophylls generally form compact strobili. Younger parts of leaves and rhizome are surrounded by brown hairy structures called scales or ramenta. The Governor acts as the agent of the centre. Salient features of Pteridophytes . – They are flowerless, seedless, spore producingvascular plant which have successfully invaded the land. Rhizoids present instead of roots. (a) These are the oldest known vascular plants, most of them (except Psilotum and Tmesipteris) are fossils. The term Pteridophyta was first coined by Haeckel. The plant body can be divided into true root, stem, and leaves. General characteristic features of Pteridophytes: • Plant body is sporophyte (2n) and it is the dominant phase. As a result, the Right to Property is no longer a fundamental right. The following is the 11th Fundamental duty by the Constitution (Eighty-sixth Amendment) Act, 2002, s. 4 (which is yet not in. Engler (1909) included the Bryophyta and Pteridophyta under … Stomata are present on the leaves. Pteridophytes were classified by Oswald and Tippo in 1942 into following four classes: Psilopsida. Lecture on Political Background and Salient Features of 1973 Constitution. Zygote is retained within the venter of archegonium to form embryo. Here you can get Class 11 Important Questions for Biology based on NCERT Textbook for Class XI. You can change your ad preferences anytime. 10. ADVERTISEMENTS: In this article we will discuss about:- 1. 3. Enumerate four salient features of Pteridophytes. The different plant phyla are described below: 1. Characteristics of Pteridophytes . Write the biological names of any two plants. Pteridophytes were world wide in distribution and abundant in the geological past. (iv) By apogamy: In some cases, development of sporophyte occurs directly from gametophyte without intervention of sex organs, it is called apogamy and such plants are genetically haploid. Salient Features of Psilotum: i. The Indian President and the State Governor are mere Constitutional heads. Emprendedores Motivación, Creatividad, Social y más.. Motivación La motivación es un factor importante al emprender un negocio, tanto para el emprendedor como para la gente que colabora con el en su proyecto, en esta sección presentaremos diferentes materiales para ayudar a impulsar esa parte. Smallest pteridophyte is Azolla whereas the largest is Cyathea/Alsophila (Tree ferns). Water is required for transfer of antherozoids the male gametes released from the antheridia, to the mouth of archegonium. In some pteridophytes the gametophyte is protected by remaining in the spores of the previous sporophyte generation. The Planning Commission has emerged as a 'super cabinet' or a 'super state'. Heterospory . Define Species. The presentation is about the salient features of Indian Constitution, it talks about the preamble, duties, etc of the Indian Constitution. (ii) Medicines : An anthelmintic drug is obtained from the rhizomes and petioles of the fern Dryopteris. The female; gametophytes in these plants are retained on the parent sporophytes for variable periods. The plants show great variation in their morphology. The judges are free from the executive control. The sporophytes bear sporangia that are subtended by leaf-like appendages called sporophylls. The upright branches are leafless. (2) Sexual reproduction: The reproductive structure in Selaginella is strobilus or spike. e.g., Psilotum, Tmesipteris. Pteridophytes are the first true land plants. Ferns and lycophytes share a life cycle and are often collectively treated or studied, for example by the International Association of Pteridologists and the Pteridophyte Phylogeny Group . e.g., species of Lycopodium, Nephrolepis, Selaginella, Lygodium, Anemia, Cyathea etc. What are Polyribosomes? Selaginella is mainly found in damp shaded places. Phylogeny. Vegetative reproduction can occur through fragmentation or rhizome and adventitious buds and these on separation gives rise to new fern plant. Fusion of male gamete with the egg present in the archegonium result in the formation of zygote. (a) Stem differentiated into nodes and internodes. ADVERTISEMENTS: Gymnosperms (gymnos – naked, sperma = seed) are naked – seeded plants. ii. Pteridophytes are the first true land plants: It is speculated that life began in the oceans, and through millions of years of evolution, life slowly adapted on to dry land. The megasporangium is four-lobed structure with a 2-layered jacket, one layer of tapetum and a large number of microspore mother cell. 13. Ø Most of the present day Pteridophytes are with herbaceous stem, some are woody. A … Reproduction takes place by vegetative and sexual (by spores) method. Part - B AnsweraTly‘FlVEof the following questions in 3-5 sentences each, wherevefapplicable. Features of Pteridophytes. Salient features of agrarian reforms of the philippines e.g., Dryopteris, Pteris, Pteridium, Polypodium, etc. Ø Branches do not arise from the axils of leaves. Plant Kingdom: Salient features, classification and alternation of generations of the plants of the following groups – Algae, Bryophytes, Pteridophytes, Gymnosperms and Angiosperms 1.3. They don’t have conducting tissues for transportation of water and minerals. In S.rupestris, there is only a single megaspore. The framers of our constitution studied other constitutions, selected their valuable features and put them with necessary modifications in our constitution. words Pteron = feather and phyta = plants; means plants with feather like fronds or ferns) includes a group of primitive land plants with well developed vascular system • This group has been referred to as vascular cryptogams and classified by Carolus Linnaeus (1754) under the class Cryptogamia (Greek words kruptos = hidden and gamos = weeded; means plants with concealed flowers or the plants … (b) Water is indispensable for the process of fertilization. Pteridophytes are seedless plants. (iii) Food : The sporocarps of Marsilea are rich source of starch and used by tribals for their nutritive value. They are seedless, vascular cryptogams: Pteridophytes are seedless, and they procreate through spores. Most pteridophytes are terrestrial plants and thrive well in abundant moisture and shade while some flourish well in open, dry situations especially in xeric conditions. Microeconomics: Introduction and basic concepts, No public clipboards found for this slide. All these are classified as vascular plants. Adiantum is commonly called ‘Maiden hair fern’. The non-fern pteridophytes are comparatively less in number. Pteridophytes are seedless and they are the simplest plants amongst the Tracheophytes (i.e., plants containing vascular tissues). However, only one megaspore mother cell is functional. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Some of the species belonging to this division have small leaves called the microphylls. Looks like you’ve clipped this slide to already. It is differentiated into root, stem and leaves. Bryophyta and Pteridophyta. Genera like Selaginella and Salvinia which produce two kinds of spores, macro (large) and micro (small) spores, are known as heterosporous. – Pteridophytes represent an intermediate position between bryophytes and spermatophytes (Gymnosperm and Angiosperm). When leaves are mature they bear groups of sori on the-under surface of fertile pinnae. The pteridophytes occupy the intermediate position in between the bryophytes on one hand and the phanerogams on the other. ADVERTISEMENTS: In this article we will discuss about the classification of pteridophytes. Sexual reproduction takes place through spores.Spores are born in sporangia. • Roots are adventitious. These organs possess well ­differentiated vascular tissues. (d) The structure and ontogeny of sex organs i.e. 9. Clipping is a handy way to collect important slides you want to go back to later. – The pteridophytes (Gk. The main body consists of a wall having two layers, inside which are present numerous small microspores (400-2000). Fern plant is sporophytic (2n) with an underground rhizomatous stem, large aerial leaves or fronds and adventitious roots. Salient features of the Solow model of economic growth. Their tenure is guaranteed and their salaries are fixed by the Constitution. On the basis of their anatomy Jeffrey in 1902 divided the vascular plants into two types or ‘stocks’. Leaf bases are persistent. (c) Sporangia develop on the ventral surface of the sporophylls, usually aggregated into sori. (g) Sex organs are surrounded by sterile jacket. They possess certain combinations of major characters which are not found in bryophytes or in phanerogams. 1. (e) Presence of distinct alternation of generations. Reproduction in Psilotum 3. (c) Roots are absent, instead dichotomously branched rhizome is present. Salient features of indian constitutions. – They are flowerless, seedless, spore producingvascular plant which have successfully invaded the land. (ii) Microsporangia: Borne on microsporophylls having a large number of small spores.
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