Pollen tube subsequent pollination (transfer of pollen grains to the pistil, the female reproductive organ). Transfer of pollen is usually carried out by wind, water, or animals . The ovaries hold the ovules that produce the female gamete: the egg cell, which waits in place for fertilization. Once a pollen grain settles on a compatible pistil, it may germinate in response to a sugary fluid secreted by the mature stigma. Lipids at the surface of the stigma may also stimulate pollen tube growth for compatible pollen. Plants that are self-sterile often inhibit the pollen grains from their own flowers from growing pollen
The Grain of Wheat than the original. The image of the grain of wheat dying in the earth in order to grow and bear a harvest can be seen also as a metaphor of Jesus' own death and burial in the tomb and his resurrection. The Rev. William D. Oldland in his sermon "Unless a Grain of Wheat Falls into the Earth and Dies" said: The Apostle Paul also says: "What is sown in the earth is subject to decay, what rises is incorruptible" (1 Cor. 15:42). The Grain of Wheat Parable of the Grain of Wheat (Greek: ὁ κόκκος τοῦ σῑ́του; "ho kókkos