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How does the embryo sac function in angiosperm reproduction?
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angiosperm
Snake gourd (Trichosanthes cucumerina) in bloom.
In angiosperms, the embryo sac functions as the female gametophyte, which is essential for sexual reproduction and the development of the seed. It develops within the ovule and typically consists of eight nuclei organized into seven cells.123
The embryo sac facilitates double fertilization, a process unique to flowering plants. Its functional components include:45
- Egg Apparatus: Located at the micropylar end, this consists of the egg cell and two synergids. The synergids help guide the pollen tube to the egg.14
- Central Cell: Contains two polar nuclei that fuse with one of the two sperm cells delivered by the pollen tube to form a triploid endosperm nucleus. This endosperm serves as a vital nutritive tissue for the developing embryo.143
- Antipodals: Three cells located at the opposite pole that may play a role in embryo nutrition in certain species.1
By maturing before food storage occurs, the embryo sac ensures that resources are only committed to seed development after successful fertilization, preventing the waste of nutrients.6