. Laboratory problems in civic biology. Biology. PROBLEM 77 93 Conclusion. — 1. Judged from the texture, what might be the use to the plant of the outer layer of the bark ? 2. Judged from the color, what might be the use of the middle layer? Note. — The inner layer of bark is known as the bast. It consists of tubelike cells which carry food from the leaves toward the roots. 3. What are all the uses of the bark? Drawing. — Make a cross section of a woody stem, labeling all the parts. Home Work. — Take two potatoes of equal weight. Peel one, leave the other unpeeled. Place the peeled potato (wit
. Laboratory problems in civic biology. Biology. PROBLEM 77 93 Conclusion. — 1. Judged from the texture, what might be the use to the plant of the outer layer of the bark ? 2. Judged from the color, what might be the use of the middle layer? Note. — The inner layer of bark is known as the bast. It consists of tubelike cells which carry food from the leaves toward the roots. 3. What are all the uses of the bark? Drawing. — Make a cross section of a woody stem, labeling all the parts. Home Work. — Take two potatoes of equal weight. Peel one, leave the other unpeeled. Place the peeled potato (with peelings) on one pan of a balance, the unpeeled potato on the other. Allow these to remain on the balance for several days. What changes do you note ? Remembering that the potato is an underground stem, determine another function of the bark. (See page 99, Civic Biology.) Problem, 77.' To prove that liquids rise through stems. (Review.) Materials. — Growing pea or bean seedling, red ink. Method. — Place the roots of a growing plant in a weak solution of eosin or red ink. Leave a few hours in a sunny place. Observations. — Notice the stems and leaves of the young plants, particularly the veins in the leaves. Copy the accom- panying figures in your note- book and color them to show where fluids rise. Conclusion. — Through what part of the stem and leaves uo liquids rise?. 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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