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 are made of plant tissues, which are made of plant cells. 1  All plants have tissues, but not all plants possess all three of the following types of tissues: 2  Dermal tissue: Consisting primarily of epidermal cells, dermal tissue covers the entire surface of a plant.