Concept: This question tests your knowledge of flower morphology, specifically the terminology used for the perianth.

Why (C) is correct: When the sepals (outer whorl, typically green) and petals (inner whorl, typically colorful) of a flower are indistinguishable and form a single whorl, this combined structure is called the perianth. The individual units of such a perianth are known as tepals. This is common in monocots like lilies and tulips.

Why other options are wrong:

• (A) Sepals: These are individual components of the calyx, the outermost whorl of a flower, typically green and leaf-like.
• (B) Petals: These are individual components of the corolla, the whorl inside the calyx, typically brightly colored to attract pollinators.
• (D) Bracts: These are modified leaves found at the base of a flower or inflorescence, not part of the perianth itself.

NEET Tip: Remember that 'tepal' is a portmanteau of 'sepal' and 'petal', indicating their fused or undifferentiated nature.

Correct Answer: (C)