Poaceae and Asteraceae are plant families, whereas Capitulum head is a type of inflorescence (a flower arrangement). So, Capitulum head is the odd one out because it is not a family but a structural feature of flowers.
Which one is odd? Poaceae, Asteraceae, Capitulum head
Review the verified answer and explanation for this SPSC – Sindh Public Service Commission past-paper question on CampusFin.