. Beginnings in agriculture. Agriculture. 110 AGRICULTURE The stem. — As the I)hint has a root system to gather the water and mineral foods needed in its growth, so it has a leaf system to take from the air the food sub- stances which it needs from the air. The stem (or, in the case of trees, the trunk), branches, and twigs, connect the work- ing centers, the roots and the leaves, so that theyL can exchange products needed by each other. In the stem are '' ducts,'' or tube-like channels, in which the soil water travels upward rapidly to the leaves. There are other channels, made by a chain of
. Beginnings in agriculture. Agriculture. 110 AGRICULTURE The stem. — As the I)hint has a root system to gather the water and mineral foods needed in its growth, so it has a leaf system to take from the air the food sub- stances which it needs from the air. The stem (or, in the case of trees, the trunk), branches, and twigs, connect the work- ing centers, the roots and the leaves, so that theyL can exchange products needed by each other. In the stem are '' ducts,'' or tube-like channels, in which the soil water travels upward rapidly to the leaves. There are other channels, made by a chain of cells, through which the food manufac- tured in the leaves is car- ried to the roots and to the other parts of the plant, to be stored or to be used in growth. The stem supports the leaves, and is an important link in the circulatory system of the plant. The leaf system. — Air is a gas; that is, it is a substance that is. Fig. 52. — The years' growth. The hirge branches represent the ends of the different years growths of the main shoots. 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 Mann, Albert Russell, 1880-. New York, Macmillan company
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Keywords: ., bookcentury1900, bookdecade1910, bookpubl, booksubjectagriculture
