EMBRYO SAC / FEMALE GAMETOPHYE
- Haploid (n)
- Develop from one functional haploid megaspore, so called, monosporic development.
- Cell division - mitotic nuclear division.
- Mature gametophyte has-
- 7 cells= 3 antipodal cells + 2 synergids + 1 egg cell ( female gamete) + central large cell
- 8 nuclei = 3 antipodal nuclei + 2 synergid nuclei + 1 egg cell nuclei + 2 polar nuclei
- So, embryo sac is in 7 celled, 8 nucleated stage.
- 2 synegids + 1 egg cell = egg apparatus
- Synergids have special structure- filliform apparatus
- Filliform apparatus- it guides the pollen tube into embryo sac towards egg cell.
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