. Laboratory problems in civic biology. Biology. 92 CIRCULATION AND USES OF FOOD BY PLANTS Dicotyledoa Monocotyledon S 6Gd Observations.— Compare stems of a dicotyledon (apple) and a monocotyledon (corn); also, leaves of dicotyledons, oak, elm, or chestnut with those of monocotyledons, lily, grass, or corn. Conclusion. — 1. Make table comparing differences of (1) stems, (2) leaves, (3) seeds. Note the difference in position in the stem of pith and bundles. (Use lens.) 2. Where is the woody part in a dicoty- ledon? Where in a monocotyledon ? Problem, 76: To study the structwre of a woody stem.
. Laboratory problems in civic biology. Biology. 92 CIRCULATION AND USES OF FOOD BY PLANTS Dicotyledoa Monocotyledon S 6Gd Observations.— Compare stems of a dicotyledon (apple) and a monocotyledon (corn); also, leaves of dicotyledons, oak, elm, or chestnut with those of monocotyledons, lily, grass, or corn. Conclusion. — 1. Make table comparing differences of (1) stems, (2) leaves, (3) seeds. Note the difference in position in the stem of pith and bundles. (Use lens.) 2. Where is the woody part in a dicoty- ledon? Where in a monocotyledon ? Problem, 76: To study the structwre of a woody stem. Materials. — Small cross sections of apple, horse chestnut, or any other woody stem. Page 98, Civic Biol- ogy- Observations. — In a cross section of apple or any other woody twig note: I. The central soft part, the pith. 2. The wood. 3. The hark. Can you find radiating lines, medullary rays, in the wood? How many layers of bark do you see?. St em c, cotyledon ,• e, endosperm; h, hypocotyl; p, plu- mule ; fb, fibrovasoular bundles. Note. — Between the wood and the bark is a rapidly growing layer called the 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, Cincinnati [etc. ] American Book Company
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