. Beginners botany. Botany. and the plant straightens and the cotyledons expand. These coty- ledons, or " halves of the bean," persist for some time (/;, Fig. 19). They often become green and probably perform some function of foliage. Because of its large size, the Lima bean shows all these parts well. Germination of Castor Bean. —• In the castor bean the hilum and micropyle are at the smaller end (Fig. 20). The bean " comes up " with a loop, which indicates that the hypocotyl greatly elongates. On examining germin- ating seed, however, it will be found that the cotyledons
. Beginners botany. Botany. and the plant straightens and the cotyledons expand. These coty- ledons, or " halves of the bean," persist for some time (/;, Fig. 19). They often become green and probably perform some function of foliage. Because of its large size, the Lima bean shows all these parts well. Germination of Castor Bean. —• In the castor bean the hilum and micropyle are at the smaller end (Fig. 20). The bean " comes up " with a loop, which indicates that the hypocotyl greatly elongates. On examining germin- ating seed, however, it will be found that the cotyledons are contained inside a fleshy body, or sac {a, Fig. 21). This sac is the endosperm. Against its inner surface the thin, veiny coty- ledons are very closely pressed, ab- FiG. 19. — Germination of Bean. Fig. 20. — Sprout- ing OF Castor Fig. 21.— Germina- tion OF Castor Bean. Fig. 22. — Castor Bean. Endosperm at a, a; coty- ledons at b. Fig. 23.— Germination Complete in Castor Bean. Endosperm at a, sorbing its substance (Fig. 22). The cotyledons increase in size as they reach the air (Fig. 23), and become func- tional 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 Bailey, L. H. (Liberty Hyde), 1858-1954. Toronto : Macmillan
Size: 2385px × 1048px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1921
