The growth of pollen tube towards the ovule is dreto
Hydro tropism
Chemo tropism
Geo tropism
Photo tropism
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Pollen tube growth is toward eggs of the same species as the pollen. Intraspecific signaling helps fertilize egg and sperm of the same species. The signaling in the style is important as pollen tubes can grow without the presence of an embryo sac with just interaction with the style.
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Chemotropism is right answer
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