. Botany for agricultural students. Plants. THE DEVELOPMENT OF THE OVULE INTO A SEED 43 fusions, there are two fertilizations, and the two fertihzations are called " double ; Both egg and primary endo- sperm nucleus are now said to be fertilized, and the pollen grain has performed its function, which is an important one, for with- out fertilization the ovule would not develop into a seed. Pollination, the growth of the pollen tube to the embryo sac, and the formation of the two sperms are simply preliminary acts to fertilization, which is the final achievement of the pol
. Botany for agricultural students. Plants. THE DEVELOPMENT OF THE OVULE INTO A SEED 43 fusions, there are two fertilizations, and the two fertihzations are called " double ; Both egg and primary endo- sperm nucleus are now said to be fertilized, and the pollen grain has performed its function, which is an important one, for with- out fertilization the ovule would not develop into a seed. Pollination, the growth of the pollen tube to the embryo sac, and the formation of the two sperms are simply preliminary acts to fertilization, which is the final achievement of the pollen grain. Study the pollen grains shown in Figure 49. Notice that the tube has broken through the. Fig. 5L — Stigma of Corn show- ing how the pollen grains grow their tubes into the stigma, p, pollen grains; f, pollen tube. Much 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 Martin, John N. (John Nathan), b. 1875. New York, John Wiley ; London, Chapman & Hall
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectplants, bookyear1919
