Male sex organ in plants








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The flower is the characteristic structure concerned with sexual reproduction in flowering plants angiosperms. A cross section of an anther shows that it consists of two lobes and each lobe further contains two pollen sacs. Cambridge University Press. Each flower is either "staminate" having only functional stamens and thus "male", or "carpellate" or "pistillate" having only functional carpels and thus "female". The sepals and petals together form the perianth. Heads may have florets of one sexual morphology — all bisexual, all carpellate or all staminate when they are called homogamous , or may have mixtures of two or more sexual forms heterogamous.

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Identify Parts Of Flower Flashcards

Flora of North America. Ovules contain the female gamete of a plant. If separate staminate and carpellate flowers are always found on different plants, the species is called dioecious. The breeding system, or how the sperm from one plant fertilizes the ovum of another, depends on the reproductive morphology, and is the single most important determinant of the genetic structure of nonclonal plant populations. However, Amborella plants may change their "sex" over time.

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A "complete" flower, like that of Ranunculus glaberrimus shown in the figure, has a calyx of outer sepals and a corolla of inner petals. Plant reproductive morphology is the study of the physical form and structure the morphology of those parts of plants directly or indirectly concerned with sexual reproduction. The selective advantage of outcrossing appears to be the masking of deleterious recessive mutations. Ovules are present in large number inside the ovary. However, "dioecy has proven difficult to explain simply as an outbreeding mechanism in plants that lack self-incompatibility". The primary mechanism used by flowering plants to ensure outcrossing involves a genetic mechanism known as self-incompatibility. These include plants that reproduce vegetatively by runners or bulbils, or which produce seeds without embryo fertilization apomixis.

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Description: In ferns and seed plants including cycads , conifers , flowering plants , etc. In one study, five cuttings from a male plant produced only male flowers when they first flowered, but at their second flowering three switched to producing female flowers. The middle elongated part of the carpel is called style. These include plants that reproduce vegetatively by runners or bulbils, or which produce seeds without embryo fertilization apomixis. Structurally, the flowers may be bisexual, consisting of two stamens and an ovary, or may be male staminate , lacking a functional ovary, or female carpellate , lacking functional stamens. Following are the main parts of a flower. Cell wall Phragmoplast Plastid Plasmodesma Vacuole. However, "dioecy has proven difficult to explain simply as an outbreeding mechanism in plants that lack self-incompatibility". Spores may be identical isospores or come in different sizes microspores and megaspores , but strictly speaking, spores and sporophytes are neither male nor female because they do not produce gametes.
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