. A civic biology : presented in problems. Biology; Sanitation. 94 PLANTS MAKE FOOD. Protein food is present in the leaf, and is found in the stem or root as well. Proteins can apparently be manufactured in any of the cells of green plants, the presence of light not seeming to be a nec- essary factor. How it is manufactured is a matter of conjecture. The minerals brought up in the soil water form part of its composi- tion, and starch or grape sugar give three elements (C, H, and 0). The element nitrogen is taken up by the roots as a nitrate (nitrogen in combination with lime or potash). Protei
. A civic biology : presented in problems. Biology; Sanitation. 94 PLANTS MAKE FOOD. Protein food is present in the leaf, and is found in the stem or root as well. Proteins can apparently be manufactured in any of the cells of green plants, the presence of light not seeming to be a nec- essary factor. How it is manufactured is a matter of conjecture. The minerals brought up in the soil water form part of its composi- tion, and starch or grape sugar give three elements (C, H, and 0). The element nitrogen is taken up by the roots as a nitrate (nitrogen in combination with lime or potash). Proteins are probably not made directly into protoplasm in the leaf, but are stored by the cells of the plant and used when needed, either to form new cells in growth or to re- pair waste. While plants and animals obtain their food in different ways, they probably make it into living substance (assimilate it) in exactly the same manner. Foods serve exactly the same purposes in plants and in ani- mals ; they either build living matter or they are burned (oxidized) to furnish energy (power to do work). If you doubt that a plant exerts energy, note how the roots of a tree bore their way through the hardest soil, and how stems or roots of trees often split open the hardest rocks, as illustrated in the figure above. Starch-Making and its Relation to Human Welfare. - - Leaves which have been in darkness show starch to be present soon after exposure to light. A corn plant sends 10 to 15 grams of reserve material into the ears in a single day. The formation of fruit, and especially the growth of the grain fields, show the economic im- portance of this fact. Not only do plants make their own food and store it away, but they make food for animals as well. And «,. 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 Hunter, Geor
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