Which of the following is NOT a part of the flower?

Roots are not a part of the flower. Flowers are reproductive structures found in angiosperms (flowering plants) and primarily consist of various components such as sepals, pistils, and stamens.

Sepals are the green, leaf-like structures that protect the flower before it opens. The pistil is the female reproductive part of the flower, typically composed of the stigma, style, and ovary. Meanwhile, stamens are the male reproductive parts that produce pollen and usually consist of an anther and a filament.

In contrast, roots are crucial for the plant's growth and stability as they anchor the plant in the soil and absorb water and nutrients, but they do not play a role in the flower’s structure or reproductive functions. Therefore, identifying roots as not a part of the flower is accurate.