. Botany for high schools. Botany. 202 GROWTH AND WORK OF PLANTS. 339. Dispersal of seeds by animals.—In general there are two ways in which animals distribute seeds: first, by eating the fruits; second, by seeds which cling to their bodies. Edible seeds and f ruits. In the case of small seeds or grains which are eaten by animals not all the seeds are crushed and some pass through the alimentary canal unharmed. In the case of fruits eaten by animals many have small seeds with hard seed coats, and very few of these seeds are crushed. The hard seed coats further protect the embryo from the solve
. Botany for high schools. Botany. 202 GROWTH AND WORK OF PLANTS. 339. Dispersal of seeds by animals.—In general there are two ways in which animals distribute seeds: first, by eating the fruits; second, by seeds which cling to their bodies. Edible seeds and f ruits. In the case of small seeds or grains which are eaten by animals not all the seeds are crushed and some pass through the alimentary canal unharmed. In the case of fruits eaten by animals many have small seeds with hard seed coats, and very few of these seeds are crushed. The hard seed coats further protect the embryo from the solvent action of gastric juices, while in the case of some seeds it is believed that they germinate better after being sub- jected to the action of various sub- stances while passing through the alimentary canal of birds, etc. Fruits like the raspberries, blackberries, grapes, cedars, are eaten by birds and other animals and the seeds de- posited often far away from the place where they were grown. Many such fruits have bright colors and attractive flavors at the time of ripening. Grapplers on seeds and fruits. These are well known to nearly all persons who tramp the fields or forest, and may also be picked up " along the high- ways and in gardens. Hooks or barbs are produced on parts of the fruit which cling tenaciously to rough soft objects coming in; contact with them. Common among these are the " beggar ticks," the akenes of one of the composites (Bidens)^ which have barbs on the two lateral prongs at one end of the flattened fruit. In some sections these are called devil's ; Slender Fig. 163. Fruit of burdock (Arctium lappa).. 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 Atkinson, George Francis, 1854-1918. New York, H. Holt and Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbotany, bookyear1910
