Concept: This question tests your understanding of floral morphology, specifically the term pentamerous and its relation to the number of floral appendages.

Why (C) is correct: A flower is described as pentamerous when its floral appendages (sepals, petals, stamens, carpels) are present in multiples of five. This is a characteristic feature often seen in dicotyledonous plants.

Why other options are wrong:
A) If floral appendages are in multiples of 3, the flower is trimerous (characteristic of monocots).
B) If floral appendages are in multiples of 4, the flower is tetramerous.
D) If floral appendages are in multiples of 6, the flower would also be considered trimerous (as 6 is a multiple of 3).

NEET Tip: Remember that monocots typically have trimerous flowers (multiples of 3), while dicots often have tetramerous or pentamerous flowers (multiples of 4 or 5).

Correct Answer: (C)