Answer:
Following compatible pollination, the
pollen grain germinates on the stigma to produce apollen tube through one of
the germ pores. The contents of the pollen grain (2 mole nuclei)move into the
pollen tube. Pollen tube grows through the tissues of the stigma and reachesthe
ovary.
After reaching the ovary, pollen tube,
entersthe ovule through the micropyle and thenentersthe embryo sac by passing
into one of the synergids through the fill form apparatus.It leadsto the
degeneration of that synergid.
The pollen tube breaks to
release its contents (2 male nuclei). Out of the two male gametesone fuses with
egg and the other fuses with central cell and fertilize.
Longitudinal
section of a flower showing path of pollen tube growth
The component cells of the egg-apparatus
in an embryo sac include, two synergids, one egg cell and the filiform
apparatus.
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