. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 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 certai
. Elements of biology; a practical text-book correlating botany, zoology, and human physiology. Biology. 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, Chestnuts; fruits sur- rounded by a prickly in- 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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