. The essentials of botany. Botany. PROTOPLASM AND PLANT-GELLS. 15 23. Starch is a plant-food. It is produced by the green protoplasm for the nourishment of the plant. As it forms only in light, during the day it accumulates, but at night. Fig. 9. Fio. 10. Fig. 9.—a few cells of the seed of a Pea, showing large starch-graina XSt) and the little granules of aleurone (a). At i, i, are shown intercellu- lar spaces. Magnified 800 times. Fig. 10.—Leucoplasts (I) and young starch-grains of an orchid (Phajus). Magnified 540 diameters. {From Strasburger.) by the continued activity of the plant it is g
. The essentials of botany. Botany. PROTOPLASM AND PLANT-GELLS. 15 23. Starch is a plant-food. It is produced by the green protoplasm for the nourishment of the plant. As it forms only in light, during the day it accumulates, but at night. Fig. 9. Fio. 10. Fig. 9.—a few cells of the seed of a Pea, showing large starch-graina XSt) and the little granules of aleurone (a). At i, i, are shown intercellu- lar spaces. Magnified 800 times. Fig. 10.—Leucoplasts (I) and young starch-grains of an orchid (Phajus). Magnified 540 diameters. {From Strasburger.) by the continued activity of the plant it is greatly dimin- ished. Whenever there is more made than the plant re- quires, the surplus is stored by the leucoplasts in certain cells for future use. Practical Studies.—(a) Scrape ofE a little of the substance ol the cut surface of a potato-tuber. Mount in water and examine under the microscope, using the \ objective. Note the ovate starch-grains, which are concentrically striated. Now add a small drop of iodine and note the blue coloration, which becomes purple or purple-black if much iodine is used. (b) Make an extremely thin slice of the potato-tuber and treat as before, so as to observe starch-grains in the cells. By staining such. 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 Bessey, Charles E. (Charles Edwin), 1845-1915. New York : Holt
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbotany, bookyear1896
