A flower, sometimes known as a bloom or blossom, is the reproductive structure found in plants that are floral plants of the division Magnoliophyta, also called angiosperms. The biological function of a flower is to effect reproduction, usually by providing a mechanism for the union of sperm with eggs. Flowers may facilitate outcrossing fusion of sperm and eggs from different individuals in a population or allow selfing fusion of sperm and egg from the same flower. Some flowers produce diaspores without fertilization parthenocarpy. Flowers contain sporangia and are the site where gametophytes develop.
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授權類型 | 尺寸 | 像素 | 格式 | 點數 | |
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標準授權 | S | 800 x 600 | JPG | 15 | |
標準授權 | M | 2000 x 1500 | JPG | 18 | |
標準授權 | L | 2581 x 1936 | JPG | 20 | |
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標準授權 | TIFF | 5159 x 3869 | TIF | 39 | |
進階授權 | WEL | 4000 x 3000 | JPG | 88 | |
進階授權 | PEL | 4000 x 3000 | JPG | 88 | |
進階授權 | UEL | 4000 x 3000 | JPG | 88 |
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標準授權 | 480 x 360 px | JPG | 13 點 |
標準授權 | 800 x 600 px | JPG | 15 點 |
標準授權 | 2000 x 1500 px | JPG | 18 點 |
標準授權 | 2581 x 1936 px | JPG | 20 點 |
標準授權 | 3648 x 2736 px | JPG | 22 點 |
標準授權 | 4000 x 3000 px | JPG | 23 點 |
標準授權 | 5159 x 3869 px | TIF | 39 點 |
進階授權 | 4000 x 3000 px | JPG | 88 點 |
進階授權 | 4000 x 3000 px | JPG | 88 點 |
進階授權 | 4000 x 3000 px | JPG | 88 點 |