- The sporophyte generation (the flower at the top of the diagram) will give rise to the male and female gametophytes within male and female reproductive organs, respectively. - A pollen grain (the male gametophyte), will attach to the stigma of the carpel and germinate. The pollen grain will extend a pollen tube down the style to the ovary. Once at the ovary, the tube will penetrate the ovule (at a pore called the micropyle) and deposit two sperm to the female gametophyte, the embryo sac. - In a process called double fertilization, one sperm will fertilize the egg cell to form the zygote and the other sperm will fertilize the polar nuclei to form the triploid endosperm. Endosperm serves as a nutrient-rich material that will nourish the zygote. - Once the egg cell is fertilized, the resulting zygote develops into the embryo, which is packaged in a seed. - Haploid cells called microspores will undergo mitosis to form pollen grains, the male gametophyte. A pollen grain consists of two cells: the tube cell will form the pollen tube and the generative cell will give rise to two sperm. - A haploid cell called a megaspore will develop into the embryo sac, which is the female gametophyte. The embryo sac consists of seven cells including the egg cell and a double-nucleated cell called the polar nuclei.

In angiosperms, the endosperm forms due to

- double fertilization of the female gametophyte

Which statement regarding the male gametophyte in flowering plants is correct?

- The male gametophyte is the pollen grain.

11.7.2 Alternation of Generations: Angiosperms Flashcards by Irina Soloshenko

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11.7.2 Alternation of Generations: Angiosperms Flashcards

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