. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. Grain; spikes of ripened case the pericarp has lengthened into a long wing. Hold a maple or ash fruit high above your head and allow it to fall to the ground. Does it fall directly under the point where it was held ? When and how might the wings be of use to the fruit ? * Key fruit of maple. Distinction between Seeds and Fruits — We have seen that in the case of one-seeded fruits it is sometimes difficult to distinguish between the ^^^ seed and the fruit. If we are able -^ to exam
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. Grain; spikes of ripened case the pericarp has lengthened into a long wing. Hold a maple or ash fruit high above your head and allow it to fall to the ground. Does it fall directly under the point where it was held ? When and how might the wings be of use to the fruit ? * Key fruit of maple. Distinction between Seeds and Fruits — We have seen that in the case of one-seeded fruits it is sometimes difficult to distinguish between the ^^^ seed and the fruit. If we are able -^ to examine the flower which forms a certain fruit, we ought to have no difficulty in making out all of its parts. "^ ^^^Jpi)'^ A cross section through the ovary will show us that seeds are always surrounded not only by seed coverings, but also by the ovary wall, which later forms the pericarp. In ' For laboratory exercises on dry indehiscent fruits, see Hunter and Valentine, Manual, pages 69, 70, 74, 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, American book company
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