. Elementary biology; an introduction to the science of life. Biology. NEW ORGANISMS 338. Reproduction. One of the common facts about life is that the hfe of every organism comes to an end sooner or later. Yet the species, ^ or kind, may continue j^ .^i to live for centuries. '" This is explained, of course, by the fact that new individuals are constantly being produced. The proc- ess by which organ- isms give rise to new individuals is called reprochiction. The term reproduc- tion carries the idea of a special portion of the parent organism being separated and developing into an in- divi
. Elementary biology; an introduction to the science of life. Biology. NEW ORGANISMS 338. Reproduction. One of the common facts about life is that the hfe of every organism comes to an end sooner or later. Yet the species, ^ or kind, may continue j^ .^i to live for centuries. '" This is explained, of course, by the fact that new individuals are constantly being produced. The proc- ess by which organ- isms give rise to new individuals is called reprochiction. The term reproduc- tion carries the idea of a special portion of the parent organism being separated and developing into an in- dividual. The simplest case of which we know is that of a cell division among one- celled plants or animals. When such an organism (for example, a Paramecium, or a Pleurococcus cell, or some bacterium) divides into two, it at the same time reproduces. The number of indi- viduals is thus multiplied by a process of division, or cell fission. Cell division resulting in the multiplication of individuals occurs among nearly all one-celled plants and animals. 291. Fig. 124. Yeast plant The cells of this plant multiply by pushing out buds. Under certain conditions the protoplasm of a cell divides into two and then four parts, which then can remain inactive for an indefinite time. These resting cells are called spores. 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 Gruenberg, Benjamin C. (Benjamin Charles), 1875-1965. Boston New York [etc. ] Ginn and company
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