Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] 102 BOTANY coldest months of the year. The factors which influence the ger- mination of seeds also act on the bud. Position of the Bud on the Stem. — The growth of the stem from the bud can best be observed in a very young seedling. If, for example, we examine a pea seedling, it will be seen that the epicotyl is, in truth, the first bud of the plant. It produces the first stem and leaves. The position of the most active buds deter-
Elements of biology; a practical Elements of biology; a practical text-book correlating botany, zoology, and human physiology elementsofbiolog00hunt Year: [c1907] 102 BOTANY coldest months of the year. The factors which influence the ger- mination of seeds also act on the bud. Position of the Bud on the Stem. — The growth of the stem from the bud can best be observed in a very young seedling. If, for example, we examine a pea seedling, it will be seen that the epicotyl is, in truth, the first bud of the plant. It produces the first stem and leaves. The position of the most active buds deter- mines the form of the future tree. Buds come out at the ends of branches {terminal) and at the sides {lateral). Deliquescent Tree. — If you examine a winter branch of the apple, elm, or oak tree, you will find that the lateral buds have Excurrent trees (at right) and deliquescent tree (at left). In background a row of cedars which were planted by birds roosting on a fence along a roadside. developed more strongly and more rapidly than the terminal bud. Thus the tree has come to assume during its growth a rounded shape. Such a tree, having a rather stout, short trunk, with many low, spreading, lateral branches, is said to be deliquescent. Excurrent Tree. — If, on the other hand, the terminal buds of the tree get a better supply of light, food, or if other factors aid its growth, the tree will be tall and have but one main trunk, such as the Lombardy poplar, and pines and cedars. Such a tree is named excurrent. The picture shows trees of these two shapes. Structure and Functions of the Parts of a Winter Twig. — The best way for us to understand the growth of a bud into a branch
Size: 1927px × 1038px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage
