Life cycle of corn (Zea mays), a monocot. The vegetative plant represents the diploid sporophyte generation. Meiosis occurs in the male and female flowers, represented by the tassels and ears, respectively. The haploid microspores (male spores) develop into pollen grains, and the single surviving haploid megaspore (female spore) divides mitotically to form the embryo sac (megagametophyte). The egg forms in the embryo sac. Pollination leads to the formation of a pollen tube containing two sperm cells (the microgametophyte). Finally, double fertilization results in the formation of the diploid zygote, the first stage of the new sporophyte generation, and the triploid endosperm cell.
A bean seed grows quickly into a bean plant. It is one of the fastest growing plants. After the bean is planted in the soil, it takes only a week for it to germinate. The bean plant is fully grown in six weeks. Its seeds drop into the soil or are planted there, and the life cycle begins again.
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