. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. Cross section of parsnip. The cortex (C.) is given up almost entirely to the storage of food. Note the medullary rays (,) which radiate from the center of the wood iW.).. Fascicled roots (dahlia); fibrous roots which have become thickened with stored food. Examples of other roots storing food nre carrot, radish, yam, sweet potato, etc. Demonstration. — Test a cross section of the parsnip root with iodine. In which part of the root is starch stored? Test another cross section with nitric
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. Cross section of parsnip. The cortex (C.) is given up almost entirely to the storage of food. Note the medullary rays (,) which radiate from the center of the wood iW.).. Fascicled roots (dahlia); fibrous roots which have become thickened with stored food. Examples of other roots storing food nre carrot, radish, yam, sweet potato, etc. Demonstration. — Test a cross section of the parsnip root with iodine. In which part of the root is starch stored? Test another cross section with nitric acid and ammonia. Which part of the root contains stored food? Water Roots. — In the duckweed, a plant living in water, the roots are short and contain few root hairs. The water supply is so great that few root hairs have been called forth. The water hya- cinth is another example of slight de- velopment of roots. The plant is buoyed up by the water and does not need strong roots to held it firm. Adventitious Roots. — Roots are often developed in unusual places. Roots coming out thus, as, for example, on the stem, are called adventitious. Such roots are developed along the stem of many climbing plants. Exam- j , ine and draw the roots of English ivy. See how many other common wild climbers develop adventitious 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, George William, 1873-1948. New York, American book company
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