Practice question

Typical angiosperm embryo sac follows Polygonum development: megaspore mother cell meiosis yields functional chalazal megaspore, three mitoses without cytokinesis create eight free nuclei, cellularization partitions them into seven cells. At micropylar pole egg apparatus includes single egg flanked by two synergids secreting LURE chemoattractants guiding pollen tube via filiform apparatus. Chalazal pole bears three antipodals often degenerated or proliferative in cereals. Central region holds central cell containing two polar nuclei awaiting fusion with sperm to form endosperm. This seven-celled eight-nucleate architecture dominates core angiosperms though variations tetrasporic occur in basal grades and Peperomia.