Sporopollenin allows the pollen to survive under unfavorable conditions and to be carried by wind, water, or biological agents without undergoing damage. Although the evolutionary origin of two kinds, a single linear tetrad of megaspores. 4. If both Assertion and Reason are true but Reason is not the correct explanation of Assertion. Megasporophyll Plant Kingdom Masterclass in Biology 3 NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers Show All NCERT Qs Masterclass Type Show All All complete flowers contain four whorls: the calyx, corolla, androecium, and gynoecium. Two of the nucleithe polar nucleimove to the equator and fuse, forming a single, diploid central cell. A male cone has a central axis on which bracts, a type of modified leaf, are attached. The megasporophylls are loosely arranged in, Megasporophyll is the term used in gymnosperm to denote, Now connect to a tutor anywhere from the web. Monoecious, evergreen coniferous tree, upright, narrow, strongly columnar (fastigiate) habit. Species with male and female flowers borne on separate plants are termed dioecious, or two homes, examples of which are C. papaya and Cannabis. In monocots, petals usually number three or multiples of three; in dicots, the number of petals is four or five, or multiples of four and five. The ovule wall will become part of the fruit. J. Bot. 2. If all four whorls (the calyx, corolla, androecium, and gynoecium) are present, the flower is described as complete. 1. they respire through the moist epidermis Q8. { "32.0:_Prelude_to_Plant_Reproduction" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass230_0.b__1]()", "32.1:_Reproductive_Development_and_Structure" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass230_0.b__1]()", "32.2:_Pollination_and_Fertilization" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass230_0.b__1]()", "32.3:_Asexual_Reproduction" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass230_0.b__1]()", "32.E:_Plant_Reproduction_(Exercises)" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass230_0.b__1]()" }, { "30:_Plant_Form_and_Physiology" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass230_0.b__1]()", "31:_Soil_and_Plant_Nutrition" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass230_0.b__1]()", "32:_Plant_Reproduction" : "property get [Map MindTouch.Deki.Logic.ExtensionProcessorQueryProvider+<>c__DisplayClass230_0.b__1]()" }, 32.1: Reproductive Development and Structure, [ "article:topic", "alternation of generations", "angiosperms", "authorname:openstax", "gametophyte", "sporophyte", "gynoecium", "perianth", "androecium", "antipodals", "exine", "intine", "megagametogenesis", "megasporangium", "megasporogenesis", "megasporophyll", "micropyle", "microsporangium", "microsporophyll", "polar nuclei", "synergid", "showtoc:no", "license:ccby", "licenseversion:40", "program:openstax" ], https://bio.libretexts.org/@app/auth/3/login?returnto=https%3A%2F%2Fbio.libretexts.org%2FBookshelves%2FIntroductory_and_General_Biology%2FGeneral_Biology_1e_(OpenStax)%2F6%253A_Plant_Structure_and_Function%2F32%253A_Plant_Reproduction%2F32.1%253A_Reproductive_Development_and_Structure, \( \newcommand{\vecs}[1]{\overset { \scriptstyle \rightharpoonup} {\mathbf{#1}}}\) \( \newcommand{\vecd}[1]{\overset{-\!-\!\rightharpoonup}{\vphantom{a}\smash{#1}}} \)\(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\), Describe the two stages of a plants lifecycle, Compare and contrast male and female gametophytes and explain how they form in angiosperms, Describe the reproductive structures of a plant, Describe the components of a complete flower, Describe the development of microsporangium and megasporangium in gymnosperms. Describe the development of microsporangium and megasporangium in gymnosperms Sexual reproduction takes place with slight variations in different groups of plants. Explain the following Term: Fusion between female and male gametes. Within the microsporangium, the microspore mother cell divides by meiosis to give rise to four microspores, each of which will ultimately form a pollen grain (Figure \(\PageIndex{6}\)). https://doi.org/10.1007/978-3-031-11561-5_3, DOI: https://doi.org/10.1007/978-3-031-11561-5_3, eBook Packages: Biomedical and Life SciencesBiomedical and Life Sciences (R0). Figure \(\PageIndex{2}\): If the anther is missing, what type of reproductive structure will the flower be unable to produce? Omissions? Zygote Morphology of the seed in relation to dispersal, evolution, and propagation in the genus Cycas. Upon landing on the female cone, the tube cell of the pollen forms the pollen tube, through which the generative cell migrates towards the female gametophyte through the micropyle. Fusion of the male and females gametes forms the diploid zygote, which develops into the sporophyte. The cell wall remains intact while the nucleus divides until the megagametophyte, or embryo sac, is formed., variations in the female (megasporangiate) reproductive structures among the conifers are the main basis for their classification. Undeveloped vascular tissue 4. 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\newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\) \(\newcommand{\id}{\mathrm{id}}\) \( \newcommand{\Span}{\mathrm{span}}\) \( \newcommand{\kernel}{\mathrm{null}\,}\) \( \newcommand{\range}{\mathrm{range}\,}\) \( \newcommand{\RealPart}{\mathrm{Re}}\) \( \newcommand{\ImaginaryPart}{\mathrm{Im}}\) \( \newcommand{\Argument}{\mathrm{Arg}}\) \( \newcommand{\norm}[1]{\| #1 \|}\) \( \newcommand{\inner}[2]{\langle #1, #2 \rangle}\) \( \newcommand{\Span}{\mathrm{span}}\)\(\newcommand{\AA}{\unicode[.8,0]{x212B}}\), Describe the two stages of a plants lifecycle, Compare and contrast male and female gametophytes and explain how they form in angiosperms, Describe the reproductive structures of a plant, Describe the components of a complete flower, Describe the development of microsporangium and megasporangium in gymnosperms.