A rollback does a couple of things: 1  Most importantly, a rollback reverts a question (or answer) back to a previous version in the edit history. The rollback action itself then appears as the most recent item in the edit history. 2  A rollback clears any offensive flags that have been set on a question.
In each of these whorls are one of four organs, including petals, sepals, stamens, and pistils. Petals and sepals do not play an active role in the reproductive process. Stamens and pistils, the flower's male and female reproductive organs, do aid in reproduction.
Plant Organs - Flower Flower Types âComplete âall flower parts âIncomplete âlacks one or more of the flower parts âPerfect âcontains both pistil or stamen âImperfect âlacks either pistil or stamen âSterile âboth stamen and pistil are absent