(D) The $filiform \text{ apparatus}$ is a specialized cellular thickening located at the micropylar end of the synergid cells in the embryo sac. Its p

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(D) The $filiform \text{ apparatus}$ is a specialized cellular thickening located at the micropylar end of the synergid cells in the embryo sac. Its primary function is to secrete chemical substances that attract and guide the pollen tube into the synergid. Therefore, the correct answer is $D$.