What green structures cover a developing flower?

The green structures that cover a developing flower are called sepals. Sepals are part of the flower's outer whorl and typically serve to protect the developing bud before it blooms. They are usually leaf-like in appearance and can vary in size and shape depending on the species. Their primary role is to shield the inner parts of the flower, such as the petals, stamens, and pistils, from environmental factors and potential damage until the flower is ready to open. This protective function is crucial for the successful development of the flower, ensuring that it can attract pollinators and reproduce effectively once it blooms.

In contrast, petals are often colorful and play a different role in attracting pollinators to the flower. Stamens are the male reproductive structures that produce pollen and are situated within the flower, while leaves are the primary photosynthetic organs that support the plant's overall growth and development.