Final answer:
The term for a flower bud before it blooms is 'd. Bud.' The calyx, consisting of sepals, encloses the bud, and the petals are part of the corolla inside the calyx.
Step-by-step explanation:
The term for a flower bud before it blooms is d. Bud. The calyx is the whorl of sepals which protects the developing bud by enclosing it. The sepals are usually green and leaf-like, functioning as a protective layer for the bud as it develops. Petals, which form the corolla, are typically vividly colored and situated inside the whorl of sepals, acting as attractants for pollinators. However, when it comes to the term signifying the flower's pre-bloom state, 'bud' is the specific term used.