(A) The length of the pollen tube depends on the distance it must travel through the style to reach the ovule. In $Zea mays$ (Maize), the style is ext

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(A) The length of the pollen tube depends on the distance it must travel through the style to reach the ovule. In $Zea mays$ (Maize), the style is extremely long (the silk of the corn), and the pollen tube must grow through this entire length to reach the ovary. Therefore, maize has the longest pollen tube among the given options.