Relate the sequence of events that give rise to microspores and megaspores. Describe the development of the male gametophyte. Describe the development of the embryo sac. The gamete made in the embryo sac is the egg. In the ovule, the four haploid cells that form after meiosis are called megaspores.
Pollination is the transfer of pollen grains to a stigma.
Describe the double fertilization that occurs uniquely in the flowering-plant life cycle. Cotyledons , or seed leaves, develop as part of the embryo. An ovule is an immature seed. Review major types of asexual reproductive modes among flowering plants. The plant embryo absorbs water, resumes growth, and breaks the seed coat at germination.