Final answer:
The correct order of floral whorls in an Arabidopsis flower from the exterior to the interior is sepals, petals, stamens, and carpels. This arrangement facilitates the flower's reproductive process, with each whorl performing specific functions.
Step-by-step explanation:
The correct order of whorls in a normal Arabidopsis flower, starting from the outside and moving in, is as follows:
- Sepals (Calyx)
- Petals (Corolla)
- Stamens (Androecium)
- Carpels (Gynoecium)
The outermost whorl is composed of leaf-like sepals, which form the calyx and protect the unopened bud. The second whorl consists of usually brightly colored petals, forming the corolla, which attract pollinators. Inside the petals lies the third whorl, the stamens (androecium), which are the male reproductive structures. The innermost whorl contains the carpels (gynoecium), the female reproductive part of the flower. Each of these floral parts plays a crucial role in the reproduction and lifecycle of the plant.