seed plants have four main structures. They are:?
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root, stem, leaf and flower
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cell walls give structure.
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1. Seed: a little baby plant, sleeping until the right time comes along\n2. Germination: the baby plant pokes out of its seed when there is enough moisture and the right temperature\n3. Growth: using energy from the sun and nutrients from the soil the plant grows to its full size\n4. Flowering: When it is big enough, the plant will start to make flowers so that it can make new seeds\n5. Pollination/fertilization: two types of plant parts must come together to make a new seed. Sometimes insects help this happen.\n6. New seed!
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Hi Erica, \n\nI'd waste both your and my time if I try to answer this question with lots of detail. I'd suggest you go to your textbook, flip a few pages here and there, get a broad idea and then, come back and read this answer. \n\nPlease notice that I'll have to make this answer less complex by generalizing concepts and avoiding some fine details which you can easily read in your textbook.\n\nNow, without wasting much time, here is my answer-\n\n===================\n\nCharacteristics of animal sexual life cycles-\n\n1- Usually, there are two parents- male and female. Both form special haploid cells called gametes by meiosis.\n\n2- Gametes fuse in pairs to form diploid cells called zygotes (fertilization).\n\n3- Repeated mitotic divisions of the zygote forms embryos.\n\n4- And the embryo develops into a new individual.\n\nSooo simple!\n\n====================\n\nCharacteristics of plant sexual life cycles-\n\nIt is same as animal sexual reproduction. Just that the technical terms and the methods of reproduction are a little different in flowering and non-flowering plants. I suggest you to read your textbook for the detailed terminology.\n\nIn plants-\n\n1- Diploid sporophytic cells divide by meiosis to give haploid gametophytic cells.\n\n2- Haploid gametophytic cells from male and female fuse to form the diploid zygote.\n\n3- The zygote then develops into an embryo and then to a full diploid plant body.\n\n* There are lots of finer details like the flowering system in flowering plants: pollens, ovules etc. and sporangia in non-flowering plants. I suggest you to study the life cycles of different bryophytes, gymnospermae and angiospermae to get the idea.\n\n================\n\nCharacteristics of fungal sexual life cycles-\n\n1- It involves fusion of two compatible sex cells/ gametes. The sex organs that produce gametes are called gametangia.\n\n2- The gametangia of fungi are unicellular and are surrounded by a sterile jacket. In fungi, there is a gradual reduction in sexuality from lower to the higher fungi.\n\n3- In the first stage, the cytoplasms of two sex cells fuse with each other but the nuclei do not fuse. The cell is thus called a dikaryon. (Plasmogamy).\n\n4- The nuclei then fuse to form the synkaryon. (Karyogamy).\n\n5- The diploid cell after that, produces haploid nuclei by meiosis.\n\nThere are broadly five types of sexual fusion in fungi.\n\nHere they are-\n1- Planogametic copulation. \nOne or both of the gametes are motile.\n\n2- Gametangial contact. \nThe two gametangia come together and the male gametangia forms a tube through which the male non-motile gamete is sent to the female gametangia.\n\n3- Gametangial copulation. \nThe gametangia themselves fuse together and lose their sexual identities to form zygospore.\n\n4- Spermatization. \nNumerous spore-like minute bodies (spermatia) are sent through various agencies to the receptive hyphae or trychogyne of female gametangium.\n\n5- Somatogamy.\nIn this mode, sex organs are not formed and the fusion occurs two vegetative cells resulting in the formation of dikaryon.\n\n=================\nI hope the above info helps.
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ripened ovary, seeds, flowering plant
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Gymnosperms (such as pines & firs).\n\nThe sporophyte phase is the dominant phase in the life cycle.
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Plant cells form a framework of cellulose between the cells which creates a structurs similar to a honeycomb, thereby forming a framework capable of supporting the plant's weight.
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Lysosome\nFlagella\nCentriole\nCentrifuge\nMyofibrils
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1. Prophase 2. Metaphase 3. Anaphase 4.Teleohase
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angiosperms are MOSTLY dicots.  Monocots include the grasses, grains, lilies, palms.\n\neach stage of an angiosperm life cycle has distinct traits that help determine if it is monocot or dicot.  \n\nSEEDS: Monocot is short for monocotyledons, the first seed leaves. When a corn seed sprouts or germinates, there is one coat and one seed leaf that comes out.  The seed itself does not split in two like dicot seeds do.  The dicot also sprouts 2 cotyledons or seed leaves. Peppermint seeds in two pcs and there are 2 tiny leaves seen at germination\n\nROOTS: Monocot roots are usually diffuse, Dicot roots often tap.\n\nSTEMS: Monocot stems have scattered vascular bundles\nDicot stems are organized without scattered vascular bundles. There is often bark, phloem on the outside and xylem in the heartwood.\n\nLEAVES: monocot leaves have parallel veins; dicots are branched; Mint leaves have branched veins.\n\nFLOWERS: moncot flowers, inc cs thru ovary, reveal parts in 3s and multiples of 3.  Dicot flower parts and ovary are in 4-5s and multiples of 4-5.  Mint flowers are in 4-5s.   \n\nFRUITS: are ripened ovary, a pregnant flower: you can see that the ovary had the specific regions in the ovary in the same characteristic number patterns as seen in the flowers.  Dicot fruit, like an apple,if you cut it in a transverse section, shows a five-pointed star, so apple is a dicot.  You can see the same thing in a cut cucumber and cut zucchini. I do not know about the mint FRUIT.
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The flowers have many parts that are crucial to the formation of apples:\n\n• Sepals - five green, leaflike structures that make up a flower's calyx\n• Petals - the part of a flower that attracts insects by their color and scent\n• Stamens - the male reproductive part made up of an anther and filament\n• Anther - the part of the stamen that produces pollen\n• Filament - the stalk of the stamen\n• Pistil - female part of the flower, made up of a stigma, style, and an ovary\n• Stigma - the top of a flower's pistil\n• Style - the part of a pistil that connects the stigma and the ovary\n• Ovary - the rounded base of the pistil, inside of which are five compartments each containing two ovules, female reproductive cells that can become seeds
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If you mean "what structures are inside a rose?" then here is the answer: The general structure of a flower consists of sepals, petals, pistil, and stamen.  Sepals are the green leaves that cover the flower before it blooms.  The petals are the pretty and fragrant part.  The pistil is the female reproductive structure which receives pollen and forms seeds.  The stamen is the male reproductive structure and makes pollen.  The pistil and stamen are housed in the center of the rose.  \n\nIf you are asking "what is inside rose petals that make them smell?" That is caused by oils that are formed in petals.
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It's an oversimplification to say that pollen is a plant's sperm:\n\nPollen grains are structures that house the male gametophyte generation of angiosperms and gymnosperms (seed plants).  They are also the vehicles in which the male gamete genetic code is carried to the female gamete.  Pollen grains develop in the anther in angiosperms.  It travels and is deposited on the stigma of a receptive flower.  In gymnosperms, pollen develops in the male cone, travels, and fertilizes the ovules in the female cones to produce seeds.  Each pollen grain consists of the two celled male haploid plant enclosed in a thickened wall.
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Some of the functions of the primary wall of a plant cell:\n\n    * Structural and mechanical support.\n    * maintain and determine cell shape.\n    * resist internal pressure of cell.\n    * control rate and direction of growth.\n    * ultimately responsible for plant architecture and form.\n    * regulate diffusion of material \n    * carbohydrate storage - walls of seeds may be metabolized.\n    * protect against pathogens, dehydration, and other environmental factors.\n    * cell-cell interactions.
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Apical meristem.\nDan.
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The main difference between gymnosperms and angiosperms is that the ovules and the seeds of gymnosperms are unprotected unlike the seeds of angiosperms which are enclosed in fruit.
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Phloem and Xylem.\nWeb site below is good :)