. Adventures with animals and plants. Biology. PROBLEM 2. The Fart Stems ami Roots Play hi Making Food M'5 V\G. 180 There is variety in water-condiicting tubes. A and B are found in conifers {they are called tracheids); C is a tube foimd in flow- ering plants. The walls are thickened in different ways. O. See Figure 181. If twigs are available study one carefully by doing Exer- cise 9. Along the sides of the stem are lateral buds containing cells which can grow into stems and leaves. In the spring, when growth begins again some of the lateral buds develop into branches. These stems, like the m
. Adventures with animals and plants. Biology. PROBLEM 2. The Fart Stems ami Roots Play hi Making Food M'5 V\G. 180 There is variety in water-condiicting tubes. A and B are found in conifers {they are called tracheids); C is a tube foimd in flow- ering plants. The walls are thickened in different ways. O. See Figure 181. If twigs are available study one carefully by doing Exer- cise 9. Along the sides of the stem are lateral buds containing cells which can grow into stems and leaves. In the spring, when growth begins again some of the lateral buds develop into branches. These stems, like the main stem, lengthen near the tip, form lateral buds, and before the end of the season form a terminal bud. Thus each year the branches extend farther and farther out from the trunk and each branch forms branches along its sides. When a plant lives for many years it may become very tall and wide-spreading. We see that both stems and roots grow in length only at the tips. How stems grow in width. In dicot trees and shrubs the growing tips are notice- ably thinner than other parts of the stem. The thickest part of the tree trunk is at the very bottom; the thickest part of a branch is at its base. The fact that the older parts of a stem are thicker than the newer or younger parts is good evi- dence that the stem of a tree or shrub is Terminal bud Lenticels Scars made by scales of last year's terminal bud. 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 Kroeber, Elsbeth, 1882-; Wolff, Walter Harold, 1901-. Boston : D. C. Heath
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