Choose the correct statement w.r.t. calyx.
It is composed of petals.
It usually helps in attracting insects for pollination.
It is the innermost whorl of the flower.
It is usually green in colour and protects the flower in the bud condition.
Calyx is composed of sepals. It is the outermost whorl of the flower. Petals, the units of corolla, are used to attract insects for pollination.