. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. 342 FRUITS AND SEEDS. seed.) In some cases, as in corn, the cotyledon may de- velop into an absorbing organ, drawing nourishment from the rest of the seed. (See Figure i49.) Usually a scar may be found on the surface of a seed indi- cating the point at which it was attached to the ovary. This scar may be readily found in the bean. It is called the hilum. When the seed is mature, the embryo is usually differen- tiated into the following parts: cotyledons, h
. Plant life and plant uses; an elementary textbook, a foundation for the study of agriculture, domestic science or college botany. Botany. 342 FRUITS AND SEEDS. seed.) In some cases, as in corn, the cotyledon may de- velop into an absorbing organ, drawing nourishment from the rest of the seed. (See Figure i49.) Usually a scar may be found on the surface of a seed indi- cating the point at which it was attached to the ovary. This scar may be readily found in the bean. It is called the hilum. When the seed is mature, the embryo is usually differen- tiated into the following parts: cotyledons, hypocotyl (the word means below the cotyledons), and plumule (or epicotyl, that word meaning above the cotyle- (Study Figure 150 and Fig. 150. — Embryo and seedlings of bean. The two large cotyledons entirely fill the seed; there is no endosperm. A, embryo removed dons). from the testa; the colorless testa . slips off easily after beans have been 1's explanation.) soaked in water. B, the embryo split open; it separates readily into the two cotyledons, revealing the rest of the young plant lying be- tween them; h, hypocotyl; p, plu- mule. C, young seedling, showing cotyledons, hypocotyl, plumule, and radicle; the hypocotyl is the part of the embryo below the attachment of the cotyledons; the plumule is the bud be- tween the cotyledons; it is sometimes called the epicotyl; its outer part unfolds and forms the first true leaves; the root part of the embryo, indicated by the little rootlets arising from it, is called the radicle; it is a part of the hypocotyl. D, an older seedling showing the first internode (above the coty- ledons), and the first true leaves; nourishment is still being drawn from the cotyledons. F. Cotyledons and the Divi- sions of Seed Plants. You have noted that one of the. 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 perfectl
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1913
