. Laboratory problems in civic biology. Biology. 134 SINGLE-CELLED ANIMALS AS ORGANISMS Remember that the paramcecium is a semi-fluid body, covered with a membrane. Other structures found within the cell are (1) contractile vacuoles (cv), usually one at each end of the cell; these serve to excrete liquid waste; (2) water vacuoles, clear spaces; (3) the nucleus (n), con- sisting of a double structure, the micro- and the macro-nucleus which can be seen only in a stained specimen. (Demonstra- tion.) Conclusion. — 1. What struc- tures are found in a one-ceUed animal ? 2. What uses have these struc
. Laboratory problems in civic biology. Biology. 134 SINGLE-CELLED ANIMALS AS ORGANISMS Remember that the paramcecium is a semi-fluid body, covered with a membrane. Other structures found within the cell are (1) contractile vacuoles (cv), usually one at each end of the cell; these serve to excrete liquid waste; (2) water vacuoles, clear spaces; (3) the nucleus (n), con- sisting of a double structure, the micro- and the macro-nucleus which can be seen only in a stained specimen. (Demonstra- tion.) Conclusion. — 1. What struc- tures are found in a one-ceUed animal ? 2. What uses have these struc- tures? 3. Draw a paramcecium show- ing all structures. d. Reproduction Observations. — Sometimes paramoecia may be found divid- ing crosswise by fission. In this process each of the two new cells formed contains half the original ACoiONIAL Type nucleus and half of the rest of the cell body. Draw such a specimen if you find one. In another method of reproduction, parts of the nuclei of two adjoining cells become exchanged, so that the first cell has part of the nucleus of the second cell and the second cell has part of the nucleus of the first cell. This is known as conjuga- tion. Conclusion. — 1. How do paramoecia reproduce? 2. What is the difference between fission and conjugation ?. 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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