Angiosperm Gametogenesis Complex
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Why is the generative cell located inside the vegetative cell?
It is enclosed until released for sperm production and efficient delivery through the pollen tube.
What triggers pollen tube growth?
Osmotic pressure from starch buildup and enzymatic digestion of stigma tissues.
Why does only one megaspore survive?
Resource allocation—one megaspore supports development of the embryo sac.
Why does lily have a unique 4-nuclei survival pattern?
It has tetrasporic development: all four megaspore nuclei survive and undergo distinctive fusion patterns.
Why does endosperm become triploid?
Because one sperm fertilizes a diploid central cell (from fusion of two haploid nuclei).
Which end of the embryo sac is the micropyle end?
The end with the egg apparatus (egg + synergids).
Which end is the chalazal end?
Opposite the micropyle; contains antipodal cells.
Note 
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