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Home > History and Archaeology > History > An Introduction to Structural Botany
An Introduction to Structural Botany

An Introduction to Structural Botany


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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 Excerpt: ...When the temperature is sufficiently high, and the weather is moist enough for the seeds to take up a supply of water, the process of germination begins. By germination is meant the development of the seedling from the embryo contained in the seed. The mucilaginous layer of the testa takes up water in large quantities, swells into a slimy coating, and thus helps to fix the seed to the soil. Part of the water which is thus taken up is passed on to the embryo inside, and stimulates it after its long rest to renewed growth. The hypocotyl and radicle begin to elongate rapidly, and the apex of the latter is forced out through the micropyle. In whatever position the germinating seed may lie, the radicle as soon as it becomes free curves, so that its tip is directed straight / f downwards, and at once penetrates the soil (see Fig. 51). As soon as this has happened, the young root immediately begins to develop root-hairs, which take a firm hold of the particles of soil, and serve both for nutrition and for the fixing of the plant during its subsequent growth. Meantime the hypocotyl grows very rapidly, and curves so that the apex of the stem comes to point directly upwards. The cotyledons for a time remain imprisoned in the seed-coats, which are lifted up with them above the level of the ground, but they soon spread themselves out flat, and in doing so strip off the seedcoats/ We see, then, that in germination the root grows vertically downwards and the stem vertically upwards, while the cotyledons take an approximately horizontal position. The apex of the stem (the plumule) now begins to develop further and forms leaves. The root at the same time begins to put out lateral branches, and we may now regard germination as completed; the embryo has become a seedling (se...


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Product Details
  • ISBN-13: 9781130335217
  • Publisher: Rarebooksclub.com
  • Publisher Imprint: Rarebooksclub.com
  • Height: 246 mm
  • No of Pages: 64
  • Spine Width: 3 mm
  • Width: 189 mm
  • ISBN-10: 1130335216
  • Publisher Date: 01 Mar 2012
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 132 gr

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