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The synergids of an embryo sac have special cellular thickenings at the micropylar tip called *filiform apparatus*. Their function is to:
AProvide nutrition to the egg cell
BGuide the pollen tube into the synergid
CForm the seed coat after fertilisation
DProduce hormones
Answer & Solution
Correct answer: B. Guide the pollen tube into the synergid
**Filiform apparatus** — micropylar thickenings in synergids — secretes chemoattractants and **guides pollen tube growth into a synergid**, after which the male gametes are released.
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