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The growth of pollen tubes towards ovules is due to: 

(A) Hydrotropism 

(B) Chemotropism 

(C) Geotropism 

(D) Phototropisn

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Correct option (B) Chemotropism

Explanation:

Chemotropism refers to directional growth in response to chemicals. Pollen tube grow down the style due to a chemical produced by the ovule during fertilisation

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