. Essentials of biology presented in problems. Biology. 52 FRUITS AND THEIR USES Formation of Seeds. — Each seed has been formed as a direct result of the fertilization of the egg cell {contained in the embryo sac of the ovule) by a sperm cell of the pollen tube. Seed Dispersal.! — If you will go out any fall afternoon into the fields, a city park, or even a vacant lot, you can hardly es- cape seeing how seeds are scattered by the parent plants and trees. Several hundred little seedling trees may often be counted under the shade of a single maple or oak tree. But nearly all these young trees a
. Essentials of biology presented in problems. Biology. 52 FRUITS AND THEIR USES Formation of Seeds. — Each seed has been formed as a direct result of the fertilization of the egg cell {contained in the embryo sac of the ovule) by a sperm cell of the pollen tube. Seed Dispersal.! — If you will go out any fall afternoon into the fields, a city park, or even a vacant lot, you can hardly es- cape seeing how seeds are scattered by the parent plants and trees. Several hundred little seedling trees may often be counted under the shade of a single maple or oak tree. But nearly all these young trees are doomed to die, because of the overshading and crowding. Plants, like animals, are dependent upon their. Young cedars around parent tree. Photographed by Overton. surroundings for food and air. They need light even more than animals need it, because the soil directly under the shade of the old tree gives only raw food material to the plants, and they must have sunlight in order to make food. This overcrowding is seen in the garden where young beets or lettuce are growing. The gardener assists nature by thinning out the young plants so that they may not be handicapped in their battle for life in the garden by an insufficient supply of air, light, and food. ' At this point a field trip may well be taken with a view to finding out how the common fall weeds scatter their seeds. Fruits and seeds obtained upon this trip will make a basis for laboratory work on the adaptations of seed and fruit for 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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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbiology, bookyear1911
