They are higher plants because of true root, stem, branches, flower, reproductive guts and complicated vascular system.The vegetative guts are connected in the absorb of water and minerals, to produce of food, the utilization because that growth and also development.In part reproduction.Flowers are reproductive organs which differ in size, form and color from varieties to species.The sporophyteThe angiospermic plant is diploid (2n) and a sporophyte.It is leading phase of the life cycle.It produce two morphologically and physiologically different kind of spores, the microspores (male-spore) and megaspores (female-spore).Flowes space reproductive organs.Structure of a common flowerAs we know, each flower is composed of four varieties of floral leaves: the sepals, petals, stamens and also carpals, i ordered it in whorls ~ above receptacle.The sepals and petals jointly known as perianth.The stamens and carpals space male and also female sporophyll respectively.They are very modified reproductive floral pipeline in i m sorry spores are produced.Microsporophyll(stamens)It is composed of a stalk.the filament,and a bilobed structure at its tip, known as anther.The anther lobes are linked with a tissue, the connective.Two microsporangia are present in every anther in i m sorry microspores produced.It is surrounded by many-layered sporangium wall that surround the sporogenous cells. The innermost layer which is nutritive in nature and known as taptum.The cell divide to type microspore mother sells which undergo meiosis to produce tetrads of microspores The microspores germinate to type male gametophyte.MicrosporeEach microspore is unicellular, uninucleate structure possessing two layered wall.The outer layer is thick and also called as exine and also inner is thin and known as intine.Germ pores are existing in the thin locations of exine layer.The exine provided with spinous outgrowth or reticulation in part cases.Megasporophyll(carpel)Each megasporophyll or carpel has a basal puffy part, the ovary; a stalk is present at the top of the ovary, the style and also stigma,the various modified guideline of the style.The stigma is the receptive portion which receive pollen grains.OvuleThe ovary has actually one or more rounded or oval bodies, i beg your pardon are dubbed ovules.The ovules are produced on the wall surfaces of ovary by special tissue, the placentae.Each ovule is attached come the placenta by a brief stalk, the funicle.The hilum is the location of attachment of the funicle to the key body that the ovule.The main body is composed of sporogenous tissue, the nucellus, covered by 2 protective layers the integuments. The integuments perform not surround the whole nucellus.A small opening is current at the top.The junction of the nucellus and integument is well-known as chalaza.A nucellus cabinet enlarges in size and also actsas megaspore mommy cell.It divides meiotically to develop linear tetrad of megaspores. The upper three spores disintegrate and the remaining one enlargeto kind embryo sac.The GametophyteThe gametophyte step is haploid much reduced and also dependent ~ above sporophyte.The microspores and also megaspores develop into male and also female gametophyte respectively.Male GametophyteThe very first cell that the masculine gametophyte is microspore.It is stood for by pollen grains which is semi germinated male gametophyte and also pollen tube through two sperms nuclei and a tube nucleus.The germination the the microspore start while it is tho in the microsporangium. The nucleus divides to kind a generative and a vegetative nucleus.The intine thrive up v germ spicy to form pollen tube.At semi-germinated problem the microspore now referred to as pollen grain.The pollen grains lugged to the stigma of the carpel through wind, animals, water and also insects.The move of pollen grains from anther to stigma is dubbed pollination.Then the pollen grains germinates here completely.The generative cell nucleus divides right into two to type sperm nuclei and the pollen tube which lug the sperm to the egg cell.Female Gametophyte
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The surplus food is save on computer in the seeds.such together in pea, bean and also gram. Tese seed are known as endospermic seeds.Sometimes the endosperm is totally used by occurring embryo are known as non-endospermis seeds.The seedThe ripened ovule is referred to as seed.Some seeds room dicot(2cotyledons) and also somes room monocot(1 cotyledon)The FruitThe ripened ovary is well-known as fruit.In angiospermic tree the seeds room enclosed in the fruits.The seed germinates once conditions come to be favourable.Alternation that GenerationThere are two kind of generations sporophyte and also gametophyte are current in the life bike of angiosperm tree which alternate with each other in consistent sequence.The reduction department is occurs during the development of spore i beg your pardon is revitalized at the time of development of zygote.