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Dissection Project: Hibiscus
Transcript of Dissection Project: Hibiscus
by: Maria-Cristina Santiago
& Adam Maxwell Weiner Thank you for watching
hope you enjoyed the show. hibiscus flower hibiscus flower petal beginning the dissection petal stigma beginning the dissection sepals stamens anther filament hibiscus flower sepals pollen grains carpels ovary style stigmas filament ovary ovules sepals ovary (to small to mesure individualy) (2.5 mm in length) The Importance of Flowers in Plant Reproduction
Flowers are the sites of pollination and fertilization. Flowers are home to separate male and female sporangia and gametophytes. Flowers are short stems bearing modified leaves. Each floral structure is highly specialized for a different function and they are attached in a circle to a receptacle at the base of the flower. The sepals make up the outer layer of the circle. Sepals are usually green and enclose the flower before it opens. The next layer is the petals. They are eye-catching and attract animal pollinators. If you pull back the petals, you will find the filaments of the stamens. The anther, a sac at the top of each filament, contains male sporangia and will release pollen. At the center of the flower is the carpel, which is the female reproductive structure. It includes the ovary which houses the ovules. Each ovule contains a sporangium that will produce a female gametophyte and will eventually become a seed. The ovary matures into a fruit, which aids in seed dispersal. About 90% of angiosperms use animals to transfer their pollen. The animals visit flowers in search of nectar. For pollinators, the colorful petals and alluring smells are signposts that mark food resources. Flowers are often keyed to the sense of sight and smell of certain types of pollinators. Birds are attracted by bright red and orange flowers, but are indifferent to odors; bees are attracted to fruity smells, but are indifferent to colors; the petals of bee-pollinated flowers may be marked with guides that lead to the nectar; flowers that are pollinated by night animals usually have large, light-colored, highly scented flowers that can be easily found at night; some flowers even produce an imitation of the smell of rotting flesh, attractive pollinators such as carrion flies and beetles. The location of the nectar may manipulate the pollinator’s position in a way that maximizes pollen pickup and deposition. Thus, flowers are not only the sites of pollination and fertilizations, but they also attract the animals that make pollination possible.