what are the ecoomic importances of pteridophytes?
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Many ferns have ornamental value, some are edible, and a few have medicinal/herbal uses.
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There's a fern with thousands of chromosomes.\n\nAccording to wiki, Aulacantha (protozoa) is the highest with ~1600  \n\nGod, I love wikipedia.
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Bryophytes ... they are not vascular plants.\nYour list is a real mix of plant parts (roots/shoots) and plant groups.
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both. \n1. as the plant community develops, competision takes place and also you can see one epiphyte growing on another one, althhough i would not call it facilitation, no. \n2 but especially light and humidity or lack of it can make the existence of some species easier/harder. Also the type of support makes difference, u dont see a 5kilo bromelias hanging from a telephone wire, do u? \n\nAnd, why do u want to know?
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Vegetation is a general term for the plant life of a region; it refers to the ground cover provided by plants, and is, by far, the most abundant biotic element of the biosphere. The term vegetation does not, by itself, imply anything regarding species composition, life forms, structure, spatial extent, "naturalness", or any other specific botanical or geographic characteristics. It is broader than the term flora which refers exclusively to species composition. Perhaps the closest synonym is plant community, but vegetation can, and often does, refer to a wider range of spatial scales. Primeval redwood forests, coastal mangrove stands, sphagnum bogs, desert soil crusts, roadside weed patches, wheat fields, cultivated gardens and lawns; all are encompassed by the term vegetation.
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Ha ha. If I could give you 10 points for a good question, I would :o)\n\nI am a botanist and you've got me thinking to get a T-shirt printed for our research group with your question on it.
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In general sunlight is necessary for plant growth, however this is not always the case.  Parasitic plants, such as Rafflesia and Dodder, do not require sunlight because they get all the nutrients they need from another plant (Rafflesia, for example, attaches itself to the roots of liana plants) and do not need to undergo photosynthesis at all.  So, I would say the general case is that light is necessary for plant growth but that there are some notable exceptions.
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Not sure on this but some ferns (botrichum) have incredibly high poloidly numbers... you may look there.
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harmful: parasitism\n\nit feeds off plants, no benefit to plant
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Homeostasis.\n\nFor more specifics about plants look at the bottom of the second source.
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A hydrophyte is a plant adapted to growing in water.
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No. \nGeophytes are those plants that have their growing buds below the ground. They usually have parts modified as storage organs (roots and stems forming bulbs, rhyzomes, etc) and are able to undergo unfavorable periods by staying within the soil, with their buds well protected. Thus, they're perennial.\nOn the contrary, terophytes are annual plants. These are usually grasses and forbs, plants that quickly grow, produce flowers and many seeds, and then die with the onset of unfavorable conditions. They don´t have storage organs, because they do not rely on resistance, but rather on producing many offspring that will grow in the next favorable season.
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1)water\n2)sun light\n3)Mineral nutrients\n4)Oxygen\n5)CO2\n6)Optimum Temperature\n7)Less Competition\n8)Ecological adaptations\n9)Soil or good substratum\n10)Role in local ecosystem
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Diversity is a term that refers both to the different classes of items in a given system, and also to the distribution of those items in those classes.\nBiological diversity or biodiversity is related to the concept of biocomplexity, that is, the web of interelationships and fluxes circulating in the ecosystem. It is usually measured at three levels: ecological biodiversity, species biodiversity and genetic biodiversity.\n\nSpecies biodiversity is not only the number of species in a given ecosystem, but also the proportion of individuals that belong to each species. \nExample: \nIf you have 10 species, but out of a 100-individuals sample, 91 belong to a single species, then the biodiversity is not that high. In probabilistic terms, you  could say that the chances of finding 9 of the 10 species in any sample is low. \n\nThe rainforests of the world are classical examples of high diversity ecosystems. In contrast, most ecosystems that are under continuous stress are less biodiverse, for example deserts, or grasslands. However, low biodiversity does not necessarily mean "less healthy" ecosystems. Although a grassland is less biodiverse than a rainforest, it's a stable biome all the same.\nA related concept, ecological biodiversity, refers to the variety of ecosystems in a given area, and the pattern of distribution of communities in a given landscape. No ecosystem is completely isolated from others and the health of each one depends partly on the interrelationships with other areas, therefore, the loss of ecological biodiversity due to the disappearance of certain environments can lead to greater unbalances.\nGenetic biodiversity refers to variety at genetic level. In a population, it refers to the different alleles (variations of a single gene) that are present. We know that evolutionarily speaking, polymorphisms (presence of different alleles) are a sign of a healthy population, because a greater source of variation is a better resource to respond to environmental changes. Populations that lose their genetic biodiversity (for example, because the number of individuals is severely reduced) may be more exposed to extinction. \nBiodiversity can be measured at all the organization levels studied by Ecology, but is especially focused in communities and ecosystems.
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These marne and freshwater golden algae has role as producers in the ecosystem.In low light conditions, may lose their chlorophyll and turn heterotrophic feeding on bacteria and/or diatoms so form the food chain and trophic structure of aquatic ecosystem.The diatoms and golden-brown algae are of great importance as components of the plankton and nanoplankton that form the foundation of the marine food chain.Silica is presents in the cell wall od Diatoms , so they are great soil former.
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ferns   ferns   ferns..
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The Plant Kingdom or Kingdom Plantae is divided into two: vascular and nonvascular plants. The many species of organisms in the plant kingdom are divided into several phyla, or divisions, totaling about 260,000 species.\nHere's a list of the different phyla:\n\nA. Nonvascular Plants (Bryophytes)\n\nA.1. Division Hepatophyta (liverworts)\n A.1.a. Marchantia\n A.1.b. Monoclea\n A.1.c. Riccia\n A.1.d. Sphaerocarpos\n A.1.e. Haplomitrium\n A.1.f. Cavicularia\n A.1.g. Treubia\n A.1.h. Pellia\n A.1.i. Metzgeria\n A.1.j. Scapania\n A.1.k. Porella\n A.1.l. Radula\n A.1.m. Pleurozia\n\nA.2. Division Bryophyta (mosses)\n A.2.a. Andreaeobryopsida\n A.2.b. Andreaeopsida\n A.2.c. Bryopsida\n A.2.d. Polytrychopsida\n A.2.e. Sphagnopsida\n A.2.f. Takakiopsida\n\nA.3. Division Anthocerophyta (hornworts)\n A.3.a. Anthocerotales\n  A.3.a.1. Notothyladaceae\n  A.3.a.2. Anthocerotaceae\n\nB. Vascular Plants (Tracheophytes)\n\nB.1. Division Psilophyta (whisk ferns)\n B.1.a. Psilotopsida\n\nB.2. Division Lycophyta (club mosses)\n B.2.a. Isoetopsida\n B.2.b. Lycopodiopsida\n B.2.c. Selaginellopsida\n\nB.3. Division Sphenophyta (horsetails)\n B.3.a. Equisetaceae\n\nB.4. Division Pterophyta (ferns)\n B.4.a. Aspleniaceae\n B.4.b. Ophioglossaceae\n B.4.c. Polypodiaceae\n\nGymnosperms:\n\nB.5. Division Cycadophyta (cycads)\n B.5.a. Cycadopsida\n\nB.6. Division Ginkgophyta (ginkgo)\n B.6.a. Ginkgoopsida\n\nB.7. Division Coniferophyta (conifers)\n B.7.a. Pinopsida\n\nB.8. Division Gnetophyta (gnetae)\n B.8.a. Gnetopsida\n\nAngiosperms:\n\nB.9. Division Anthophyta (flowering plants)\n B.9.a. Class Magnoliopsida (dicots)\n B.9.b. Class Liliopsida (monocots)\n\n*I think some listed are family names and not class names, but that's the grouping next to the phylum.