. Botany; principles and problems. Botany. A C Fig. 135. Fig. 136. Fig. 135.—The beginnings of a multicellular plant. A simple alga, Pleuro- coccus, in which the plant body is commonly a single cell, but in which the daughter cells following cell di\dsion may remain united in very simple colonies. Fig. 136.—The beginnings of differentiation. A thread-like or filamentous alga, Oedogonium, in which the cells are no longer all alike but have begun to be differentiated. One is modified as a holdfast (C), others as male sexual organs (a) and others as female sexual organs (o). way was thus opened f
. Botany; principles and problems. Botany. A C Fig. 135. Fig. 136. Fig. 135.—The beginnings of a multicellular plant. A simple alga, Pleuro- coccus, in which the plant body is commonly a single cell, but in which the daughter cells following cell di\dsion may remain united in very simple colonies. Fig. 136.—The beginnings of differentiation. A thread-like or filamentous alga, Oedogonium, in which the cells are no longer all alike but have begun to be differentiated. One is modified as a holdfast (C), others as male sexual organs (a) and others as female sexual organs (o). way was thus opened for the production of those very large and complex plant bodies with which we are most familiar. 2. Differentiation.—The evolution of the many-celled plant was soon followed l>y another and equally important advance, the beginning of differentiation (Fig. 136). The primitive single cell performed all the functions which we now associate with the entire plant, such as absorption, photosynthesis, and reproduc- tion. Soon after the multicellular individual had arisen, how-. 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 Sinnott, Edmund Ware, 1888-. New York, McGraw-Hill
Size: 1071px × 2334px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1920, booksubjectbotany, bookyear1923
