Placentation refers to the formation, type and structure or arrangement of the placenta. It is the attachment of ovules inside the ovary. Basal placentation is found in monocarpellary to a multicarpellary, syncarpous ovary, usually, a single ovule is attached at the base. In Asteraceae, the ovary is bicarpellary syncarpous ovary with single ovule and basal placentation is seen. In Poaceae, the ovary is monocarpellary, superior ovary with single ovule and basal placentation is seen.
So, the correct answer is 'Both Poaceae and Asteraceae'.
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