Final answer:
The petals of a flower collectively form the corolla, which is the second whorl of the flower and is known for being brightly colored to attract pollinators.
Step-by-step explanation:
Collectively, the petals of a flower form the corolla. The corolla is typically the brightly colored part of the flower that functions to attract pollinators such as birds and insects. In the structure of a flower, there are four main parts or whorls: the calyx (comprising the sepals), the corolla (comprising the petals), the androecium (comprising the male reproductive structures, such as the stamens with anthers), and the gynoecium (comprising the female reproductive structures, such as the carpels with stigma, style, and ovary). Together, the calyx and corolla form the perianth, which is the non-reproductive part of the flower. The androecium and gynoecium represent the reproductive parts of the flower, with the androecium containing the pollen and the gynoecium containing the ovules.