The main role of the filiform apparatus is that it:
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a
protects the embryo sac from any damage.
b
provides nourishment to the egg cell.
c
helps in rapid cell division inside the embryo sac.
d
helps in guiding the pollen tubes into the embryo sac.
answer is D.
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Detailed Solution
The main role of the filiform apparatus is that it helps in guiding the pollen tubes into the embryo sac. Therefore, the growth of pollen tube is said to be chemotropic.