Carpels are fused in . . .

In which condition are the flowers always in a single whorl of perianth?

Among flowers of Calotropis,tulip,Sesbania,Asparagus,Colchicum,sweet pea,Petunia,Indigofera,mustard,soybean,tobacco and groundnut,how many plants have corolla with valvate aestivation?

When two stamens are short and two are long,they are known as:

In the flowers of .......,the gynoecium is apocarpous and multicarpellary.

In which of the following plants is the androecium fused with the corolla?