. Complete farmer's guide. Agriculture; Farm life. [from old catalog]. PLANT GROWTH 21 of the little radicle begins growing downward, the other end of the germ, which is called the plumule (plu'mul) be- gins to grow upward and to drag along with it the two large parts of the bean, which look at first as if they are thick fat leaves. These two thick oval pieces are sometimes called seed leaves. They do not, however, behave like green leaves, but are full of concentrated food, which was manufactured and placed in the seed by the parent plant. This food reserve supplies the germinating plant with
. Complete farmer's guide. Agriculture; Farm life. [from old catalog]. PLANT GROWTH 21 of the little radicle begins growing downward, the other end of the germ, which is called the plumule (plu'mul) be- gins to grow upward and to drag along with it the two large parts of the bean, which look at first as if they are thick fat leaves. These two thick oval pieces are sometimes called seed leaves. They do not, however, behave like green leaves, but are full of concentrated food, which was manufactured and placed in the seed by the parent plant. This food reserve supplies the germinating plant with nourish- ment until it can develop the root hairs, stem, and leaves to gather food materials and man- ufacture its own food. These thick leaf-like pads of food are called cotyledons (kot-i-le'duns). All seeds have this reserve food in them, but all do not have the two cotyledons, nor do all plants draw them through the soil when sprouting, as do the beans. The grains and many others have only one package of reserve food than two cotyledons. Sometimes this reserve food, instead of being inclosed within a part of the embryo, is attached to the embryo, or may even merely surround it. As the plumule of the bean grows upward into a stem and the tiny leaves unfold and grow, you will notice that the cotyledons. Fig. 18. A young bean- plant just coming up with coty- ledons (a) thick and full of re- serve food. In the centre the same plant a few days later is shown with cotyledons (6) empty of food and wrinkled. On the right is a young plant that has been Stunted in its growth by the removal of the cotyledons too early, thus depriving it of its reserve food. A few plants have more. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Kyle, Edwin Jackson. [from old catalog]; Ellis, Alexander Caswell, 1871- [from old catal
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
