This document discusses various asexual plant reproduction methods, including budding, grafting, and micro-budding, highlighting their advantages and applications.
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[...] Each gamete that will be produced at the end of meiosis, whether for pollen from stamens or for ovules in ovaries, will then carry only one allele of this gene and will therefore determine the compatibility of the two gametes (document 2). Differences in alleles can lead to the expression of different traits that may be responsible for gamete incompatibility. As exemplified in document pollen grains that have different alleles will not produce a pollen tube of the same length. The pollen tube produced by the pollen grain may be, depending on the flower and the length of its style, insufficient to allow the male reproductive cell to reach the female reproductive cell (document 3). [...]
[...] Asexual plant multiplication allows obtaining new genetically identical individuals from a (piece of) organ of the mother plant. There are several asexual reproduction techniques, either from an organ of the plant, such as by tubers (for example for potatoes), by budding (for example for misery) or grafting (for example for grapevine), or from a fragment of the plant in vitro (by micro budding, as for roses). Humans benefit from this asexual multiplication as it allows for rapid multiplication of plants, artificially, rather than having to rely on the sexual reproduction of plants. [...]
[...] The entire set of these advantages shows that humans benefit from this asexual reproduction as it allows for obtaining many independent plants quickly, regardless of the sexual reproduction of plants, which can be unfruitful or long, and which serve just as much for food consumption (asexual reproduction by potato tubers, grafting of grapevine) or for ornamental plants (asexual reproduction by budding of misery or micro budding of roses). Activity the flower, organ of sexual reproduction Objective Understanding the structure of flowering plants and their role in sexual reproduction With the help of the video, complete the first diagram in the annex document (one of the two videos is not available. Title: The reproductive organs of the flower. Explanations: -The pistil is the female reproductive organ, and is composed of the following three elements: the stigma, the style and the ovaries. [...]
[...] The pollen grain 'activates': the pollen tube forms and lengthens through the style to reach the ovary, where an ovule is located. The male reproductive cell is passively guided through the pollen tube to reach the ovule, and more precisely the female reproductive cell contained within it. At the encounter of the two gametes, there may then be fertilization. This fertilization depends, as seen previously, on the compatibility of the two gametes that meet (document 2 and video unavailable on the internet). Title: The Encounter of Gametes in the Flowering Plant. [...]
[...] -The anther is the male reproductive organ, producer of pollen. To understand the structure of a flowering plant, perform a floral dissection using the protocol sheet. Complete the response document 'Floral Scheme Tracing'. Title: Floral Dissection Scheme of the Primrose. Scheme from the botanical website.org. Photograph from the biology.ens-lyon.fr website Explanations: This is an observation with the naked eye of your flower, so only the large elements composing it are visible and can be noted on your scheme. Do not go to microscopic explanation. [...]
