The growth of pollen tube towards ovule is due to (a) hydrotropism (b) chemotropism (c) geotropism (d) phototropism
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Chemotropism
The growth of a pollen tube towards ovule is induced by a chemical (sugar) substance secreted by the ripened stigma of flower into the style towards ovary. It is an example of chemotropism, pollen grain responds to stimulus by growing a polen tube in downward direction, towards ovule for fertilisation.
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