Practice question

Following double fertilization and early embryogenesis, embryo sac undergoes extensive remodeling via programmed cell death of unnecessary attraction cells. Two synergid cells that synthesized LURE peptides guiding pollen tube usually degenerate rapidly upon tube arrival preventing additional tubes via ethylene and FERONIA-mediated polyspermy block, and antipodal cells at chalazal pole degenerate quickly after fertilization, though persist longer in cereals providing transient nutrition support. Their coordinated degradation recycles valuable nutrients and eliminates residual attraction signals, efficiently allocating maternal resources to developing embryo and triploid endosperm within maturing seed for robust offspring production.