(D) The correct answer is $D$. In the family $Asclepiadaceae$ (now often classified under $Apocynaceae$),all the microspores within a single sporangiu

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(D) The correct answer is $D$. In the family $Asclepiadaceae$ (now often classified under $Apocynaceae$),all the microspores within a single sporangium are fused together to form a single,cohesive mass known as a $pollinium$ (plural: $pollinia$). This specialized structure facilitates cross-pollination by insects.