. Essentials of biology presented in problems. Biology. III. THE FUNCTIONS AND COMPOSITION OF LIVING THINGS Problem IV. An introduction to the nature and work of living organisms. (Laboratory Manual, Prob. IV.) (a) A living plant. (5) ,i living insect. -yA Living Plant and a Living Animal Compared.—A walk into the fields or any vacant lot on a day in the early fall will give us first- hand acquaintance with many common plants which, because of their abihty to grow under sometimes unfavorable conditions, are called weeds. Such plants — the dandehon, butter and eggs, the shepherd's purse — are p
. Essentials of biology presented in problems. Biology. III. THE FUNCTIONS AND COMPOSITION OF LIVING THINGS Problem IV. An introduction to the nature and work of living organisms. (Laboratory Manual, Prob. IV.) (a) A living plant. (5) ,i living insect. -yA Living Plant and a Living Animal Compared.—A walk into the fields or any vacant lot on a day in the early fall will give us first- hand acquaintance with many common plants which, because of their abihty to grow under sometimes unfavorable conditions, are called weeds. Such plants — the dandehon, butter and eggs, the shepherd's purse — are particu- larly well fitted by nature to produce many of their kind, and by this means drive out other plants which cannot do this so well. On these or other plants we find feeding several kinds of arumals, usually insects. If we attempt to compare, for example, a grasshopper with the plant on which it feeds, we see several points of likeness and difference at once. Both plant and insect are made up of parts, each of which, as the stem of the plant or the leg of the insect, appears to be distinct, but which is a part of the whole living plant or animal. Each part of the living plant or animal which has a separate work to do is called an organ. Thus plants and animals are spoken of as living organisms. Functions of the Parts of a Plant. — We are all familiar with the parts of a plant, — the root, stem, leaves, flowers, and fruit. 26. A Weed. Notice the un- favorable habitat. Pho- tograph by W. A. Bar- 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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