. Natural history object lessons : a manual for teachers. Fig. 65.—Pollen Grainswith. Fig. 66.—Tubes of Pollen Grains penetratingthe Tissue of the Stigma. active and grow. Each cell sends out a long slender tube,the pollen-tube, which slowly penetrates through the loosetissue of the stigma and through the style (when one ispresent) into the ovary. Into this pollen-tube the activevital fluid of the pollen-cell passes to the ovule, which thusbecomes fertilised. CHAPTER IX. FRUITS AND SEEDS. In the flower, as we have seen, the ovary, consisting of oneor more carpels, contains the oviiies.
. Natural history object lessons : a manual for teachers. Fig. 65.—Pollen Grainswith. Fig. 66.—Tubes of Pollen Grains penetratingthe Tissue of the Stigma. active and grow. Each cell sends out a long slender tube,the pollen-tube, which slowly penetrates through the loosetissue of the stigma and through the style (when one ispresent) into the ovary. Into this pollen-tube the activevital fluid of the pollen-cell passes to the ovule, which thusbecomes fertilised. CHAPTER IX. FRUITS AND SEEDS. In the flower, as we have seen, the ovary, consisting of oneor more carpels, contains the oviiies. After fertilisation the PLANTS AND THEIR PK0DUCT8. 45 ovary is called the seed-vessel, and the ovules become seeds inname. But before the young seeds arrive at maturity manyand important changes take place, especially in the partswhich enclose and protect the seed. The receptacle, thecalyx, as well as the carpels, play an important part in theproduction of fruits of various kinds. It should be notedthat the walls of the carpels consist of three layers, the endo-carp, the mesocarp, and
Size: 1236px × 2022px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, books, booksubjectnaturalhistory
