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The growth of pollen tubes towards ovules is due toA. hydrotropismB. chemotropismC. geotropismD. phototropism |
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Answer» Correct Answer - B 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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