Review Of Literature Wrote This In 9th Grade For Science Fair. Got All The Way To State Wit It Tho So Be Careful. Its About Marigolds And What The Effects Of Zinc, Borax, And Citric Acid Has On Them.

1562 words - 6 pages

Review of LiteraturePlants are organisms that, like everything else that is living, are made up of cells and they are in the Plantae Kingdom (Plants, p. 2893-2894). The earliest know plants that occurred were the ferns, and they appeared about 400 million years ago (Plant, 1996). Plants get their energy from the sun by a process called photosynthesis and take in food and water by their root system. Then it travels up the stem and to the leaves and/or flower (Plants, p. 2894, 2896).If your plant looks sick it probably has a disease. Plant diseases can be infectious, meaning transmitted from plant to plant, or noninfectious. Noninfectious diseases are called disorders and are most common among plants. Some disorders are caused by lack of nutrients, too much or too little water, polluted soil, or polluted air. Weather can effect a plant's growth too, for example: too much or too little sun (Plants, p. 2904)Marigolds are popular half-hardy annuals that are grown for their bright, wide flowers and bushy mounds of lacy, green leaves. The African or American Marigolds (Tagetes erecta) are large with 18-36 inch long stems. They have large flowers about two to four inches wide that are yellow, orange, or bicolored. The French Marigolds "are much daintier", with small single flowers that are also about two to four inches wide. They come in yellow, red, and orange. There are also Hybrids, that are a cross between the two species. The seeds of a Hybrid have a much lower germination rate than the American and French Marigolds. The some that do sprout have tall plants that have to be removed so they will not "detract from the others". The Hybrids don't set seed, so their flowers last longer (Proctor, p. 98). Some other species are the Large Flowered African (American) Marigolds. It has flowers that are three and a half inches across that bloom for two to three weeks and a height of 12-14 inches. They have flat, ball-like heads and come in yellow or orange. Also there are the Tall African (American) Marigolds. They also have large flowers in late summer to fall, and also come in yellow and orange. They can grow up to three feet or more and have a spread of three feet. Another Marigold is the Large Flowered French Marigold. It has a height of 12-16 inches and a spread of 12-16 inches also. The flowers are two inches in diameter and are daisy-like or super crested. In addition there is the Dwarf French Marigold. It has a height of up to 12 inches and has small one to one and a half inch flowers. They come in colors of yellow, gold, orange, and some varieties are bicolored. They bloom in early summer to late fall and the blooms could be crested, tufted, or buttoned. Furthermore there is the Single Marigold. It has a simple daisy-like blossom and long stems, which are perfect for vases (Bearce, [Online], 10/04/03). Yet another species is Irish Lace. Nobody thought that it is related to Marigolds, but it is! It has finely divided leaves with white flowers that are...

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