. Elementary principles of agriculture; a text book for the common schools. istil, some of the pollen islodged on its head and legs and body. When it entersthe next flower, some of this pollen is caught by the stigma. (Fig. 55.) Manykinds of flowers are solelydependent on the going andcoming of insects to bringabout pollination and, there-fore, the formation of fruitand seed. We used to thinkthat flowers had their gor-geous colors to please mansfancy. We now know that itis to attract the lowly in-sects. Usually, night-bloom-ing flowers are white andgive off their odors morestrongly at night (s
. Elementary principles of agriculture; a text book for the common schools. istil, some of the pollen islodged on its head and legs and body. When it entersthe next flower, some of this pollen is caught by the stigma. (Fig. 55.) Manykinds of flowers are solelydependent on the going andcoming of insects to bringabout pollination and, there-fore, the formation of fruitand seed. We used to thinkthat flowers had their gor-geous colors to please mansfancy. We now know that itis to attract the lowly in-sects. Usually, night-bloom-ing flowers are white andgive off their odors morestrongly at night (study thetuberoses, rain lilies, night-blooming cereus, moon-flow-ers, etc.), in order to attractthe night-flying moths. Blueand red flowers are daybloomers. 168. Growth of the PollenGrains. The pollen grain isa very small body, consisting of one or two it is deposited on the moist stigma, it begins togrow a slender tube (pollen-tube) down into the Fertilization. The pollen-tube produces a smallcell that contains a nucleus that passes into and unites. Fig. 56. Diagrammatic sectionovary and ovule at time of fertili-zation, m, micropyle; k, egg cell;The pollen tube has grown downthrough the style, between thew^alls of the ovary and ovule, tothe egg cell, k, of the embryo sac.
Size: 1175px × 2127px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1900, bookdecade1910, booksubjectagriculture, bookyear
