Sexual Reproduction in Flowering Plants
Floral bud is covered by
In the bud stage, the inner floral parts are covered with the outer whorl of calyx made up of sepals. When the bud opens, the sepals remain at the base at protection.
A. The whorl of petals called corolla form the next whorl after sepals. It protects the androecium and gynoecium and also attracts pollinators.
B. Anthers are the parts of stamens that produce microspores or pollen grains.
C. Sepals cover the floral bud.
D. Stigmas are the parts of carpel that receive the pollen grains.
Hence, the correct answer is 'Sepals'