Free central placentation is found in

False septum is found in the ovary of the flower of

$A$ flower which can be divided into equal vertical halves by more than one plane of division is

The side of the flower facing the mother axis is called the ..........

In many cultivated ornamental flowers,the number of petal whorls is higher than that in the wild type. These extra petals are generally modified:

In which of the following,the flowers always have a single whorl of perianth?