Talk about the composition of flowers.

Four floral whorls inserted on the receptacle. These whorls are from the outside to the inside. -Sepals: mostly green, which together form the calyx -petals: usually colored, which together constitute the corolla. The calyx and corolla are sterile protective parts and do not have a reproductive role. Together they form the perianth. -Stamens: male reproductive system which together form the androecium (filament and Anther) -Carpels: female reproductive system, which together form the gynoecium or pistil. Each carpel is formed of a lower part, the ovary containing one or more ovule, an upper part, the stigma which receives the pollen grain. Pollination (transport of pollen to male reproductive system) is done by wind, animals..