. Botany; an elementary text for schools. Plants. DIGESTION 79. 113. Excluding light from part of a leaf. 114. The result. in the sunlight again. After a niorning of bright sun- shine dissolve the chlorophyll in this leaf with alcohol; then stain the leaf with the iodine. Notice that the leaf is stained deeply in all parts except in that part over which the cork was placed, as in Fig. 114. There is no starch in the covered area. 167. Plants or parts of plants which have de- veloped no chlorophyll can form no starch. Secure a variegated leaf of co- leu s, ribbon grass, gera- nium, or of any pla
. Botany; an elementary text for schools. Plants. DIGESTION 79. 113. Excluding light from part of a leaf. 114. The result. in the sunlight again. After a niorning of bright sun- shine dissolve the chlorophyll in this leaf with alcohol; then stain the leaf with the iodine. Notice that the leaf is stained deeply in all parts except in that part over which the cork was placed, as in Fig. 114. There is no starch in the covered area. 167. Plants or parts of plants which have de- veloped no chlorophyll can form no starch. Secure a variegated leaf of co- leu s, ribbon grass, gera- nium, or of any plant showing both white and green areas. On a day of bright sunshine test one of these leaves by the alcohol and iodine method for the presence of starch. Observe that the parts devoid of green color have formed no starch. However, after starch has once been formed in the leaves, it may be changed into solu- ble substances and removed to be again converted into starch in other parts of the living tissues. 168. DIGESTION.—Starch is in the form of insoluble gran- ules. Whenever the material is carried from one part of the plant to another for purposes of groivth or storage, it is made soluble before it can be transported. When this starchy material is transferred from place to place, it is usually changed into sugar by the action of a ferment. This is a process of digestion. It is much like the change of starchy foods to sugary foods by the saliva. 169. DISTRIBUTION OF THE DIGESTED FOOD.—After being changed to the soluble form, this material is ready to be used in growth, either in the leaf, in the stem, or in the roots. With other luore complex products it is then r^'--. 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. New York, Macmillan Co.
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