Morphology of Flowering Plants

Soybean belongs to the family Fabaceae (Papilionoideae).
The flower is bisexual (⚥) and zygomorphic (%).
Calyx: five sepals, gamosepalous (united), written $K_{(5)}$.
Corolla: five petals, polypetalous and papilionaceous, consisting of one posterior standard, two lateral wings and two anterior petals united to form the keel, written $C_{1+2+(2)}$.
Androecium: ten stamens, diadelphous, nine united in one bundle and one free, written $A_{(9)+1}$.
Gynoecium: monocarpellary with a superior, unilocular ovary, written $\underline{G}_1$.
Floral formula (as in NCERT): % ⚥ $K_{(5)}C_{1+2+(2)}A_{(9)+1}\underline{G}_1$
Note: the question line is missing from the source PDF (only the four formulae are printed); it has been restored from the original paper.