Which of the following family names has the correct suffix (-aceae) according to plant classification rules?

Correct answer: Solanaceae

Answer: A, Solanaceae. In the usual botanical naming system, the names of many plant families end in -aceae. Solanaceae is the family that includes plants such as tomato, potato, chilli, and tobacco, and its name has the required ending “-aceae.” A is therefore the correct example. B, Polemoniales, has the ending -ales, which is associated with an order name rather than the usual family suffix. C, Primata, is an animal taxonomic group and does not represent a plant family with the suffix -aceae. D, Mammalia, is a class of animals, not a plant family. The question is testing the naming pattern, not the number of species in a group. Memory cue: many plant family names end in “-aceae,” while plant orders commonly end in “-ales.” Some historically conserved family names may have alternative traditional forms, but Solanaceae is a clear and standard example.