GACS lclab biology- Chapter 23- Reproduction in Plants - Vocabulary
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24 terms
Italian | English |
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 vegetative reproduction | asexual reproduction in which new plants grow from parts of an existing plant |
| chemotaxis | movement of a cell or organism in response to a particular chemical |
| protonema | small, threadlike structure produced by mosses that can develop into the gametophyte plant |
| prothallus | heart-shaped, tiny fern gametophyte |
| heterosporous | able to produce two types of spores--megaspores and microspores--that develop into female or male gametophytes |
| megaspore | spore that develops into a female gametophyte and is produced by a conifers female cone |
| microspore | spore that developes into a male gametophyte (a pollen grain) and is produced by a conifer's male cone |
| micropyle | opening of a conifer's ovule where a pollen grain can be trapped in a pollen drop |
| sepal | flower organ that protects the bud |
| petal | colorful flower structure that attracts pollinators and provides them a landing place |
| stamen | male reproductive organ of most flowers composed of a filament and an anther |
| pistil | flower's female reproductive organ; it is usually composed of a sitma, style, and an ovary |
| photoperiodism | flowering response of a plant based on the number of hours of darkness it is exposed to |
| short-day plant | plant that flowers in the winter, spring, or fall, when the number of hours of darkness is greater than the number of hours of light |
| long-day plant | plant that flowers in the summer, when there are fewer hours of darkness than the plant's critical period |
| intermediate-day plant | plant that flowers as long as the number of hours of darkness is neither too great nor too few |
| day-neutral plant | plant that flowers over a wide range in the number of hours of darkness |
| polar nuclei | in anthophytes, the two nuclei in the center of a megaspore |
| endosperm | tissue that provides nourishment to the developing embryo of flowering plants |
| seed coat | protective tissue that forms from the hardening of the outside layers of the ovule |
| germination | process in which a seed's embryo begins to grow |
| radicle | first part of the embryo to emerge from the seed and begin to absorb water and nutrients from the environment |
| hypocotyl | region of stem nearest the seed |
| dormancy | period of little or no growth that varies from species to species; in plants, an adaptation that increases the survival rate of seeds in harsh environments |
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