. Introduction to botany. Botany. SEEDS AND SEEDLINGS 159 150. Kinds of plant food found in seeds. All seeds contain some protein material, though frequently it is present only in small quantities. Carbohydrates (in the form of starch, sugar, and cellulose) and fats or oils also occur. jNlanj' other substances, such, for example, as the poison- ous compounds that occur in the seeds of larkspur and Jmison weed, and in the castor bean, the opiumpoppy, and nux vomica (out of which strychnia is made), are character- istic of certain seeds. The reserve protein is indispensable, since it is the basi
. Introduction to botany. Botany. SEEDS AND SEEDLINGS 159 150. Kinds of plant food found in seeds. All seeds contain some protein material, though frequently it is present only in small quantities. Carbohydrates (in the form of starch, sugar, and cellulose) and fats or oils also occur. jNlanj' other substances, such, for example, as the poison- ous compounds that occur in the seeds of larkspur and Jmison weed, and in the castor bean, the opiumpoppy, and nux vomica (out of which strychnia is made), are character- istic of certain seeds. The reserve protein is indispensable, since it is the basis of proto- plasm, without ^^'hich life cannot exist nor growth take place. Other reserve foods serve mamly to sup- ply buildmg material for the plant body until it can draw raw materials freely from the soil and the air and carry on photo- synthesis for itself. For tliis purpose the rice grain supplies mamly starch; the Brazil nut, oil: the grain of Indian corn, both starch and oil; and date seeds or coffee seeds, cellulose. Of the substances mentioned Fig. 142. Two stages in the growth of the bean seedling In the younger stage the arcli of the hypoeotyl is but httle above the surface; in the older stage the cotyledons have separated, the first internode has elongated considerably, and the first pair of foli- age leaves has expanded, cot, cotyledon; h, hy- poeotyl; /(o, hypoeotyl arch; i, internode; I, lent; T-j, taproot, which proceeded from the tip of the hypoeotyl; /•.,, branches of Cj. Natural size. 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 Bergen, Joseph Y. (Joseph Young), 1851-1917; Caldwell, Otis William, 1869- joint author. Boston, New York, [etc. ] Ginn and company
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