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Figure 23.5 A cross section of a lily (Lilium sp.) anther.

"Fertilization and Development of the Seed," may involve any of the apertures. One of the pollen grain's two nuclei, the generative nucleus, will later divide, producing two nuclei that become surrounded by a plasma membrane and function as sperm cells. Unlike the sperm of many plants discussed in preceding chapters, angiosperm sperms have no flagella. The remaining vegetative nucleus (often referred to as the tube nucleus) is involved in events that take place after the pollen grain has left the anther (Fig. 23.6).

Stern-Jansky-Bidlack: Introductory Plant Biology, Ninth Edition

23. Seed Plants: Angiosperms

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© The McGraw-Hill Companies, 2003

See d Plants: An

Grain Pollen Electron Micrograph
Figure 23.6 Scanning electron micrograph of a poppy pollen grain. The furrows are apertures through which a pollen tube may later emerge.

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