Question

Define the following term with regard to flower: Actinomorphic

Answer 1

Hint: 1.Solanaceae flowers are actinomorphic.
2.They can be divided into two radial halves if cut through its centre.

Complete answer:
An actinomorphic flower is a type of flower that possesses radial symmetry. These flowers can be divided into three or more identical parts, each of which are identical to each other when based on the rotating point of the center of the flower. They can also be divided into two equal vertical halves by any vertical plane. A flower when cut in two equal halves through any vertical plane passing through the axis then its symmetry remains undisturbed. Examples of actinomorphic flowers are the lily (Lilium, Liliaceae), the buttercup (Ranunculus, Ranunculaceae), Mustard, datura and chilli.

Cannaceae flowers are asymmetric which can't be dug two equal halves when traversing any vertical plane.
Poaceae and Papilionaceae flowers are zygomorphic as their symmetry remains intact when the flower is dug two equal halves only through one particular vertical plane passing through the middle . Zygomorphic flowers can also be divided into two equal halves but through the division in one plane.

Note: Other terms related to flower arrangement:
(a) Aestivation: The term ‘aestivation’ refers to the mode during which sepals or petals are arranged during a floral bud with reference to other floral members. There are four sorts of aestivation in plants, i.e., valvate, twisted, imbricate, and vexillary.
(b) Placentation: The term ‘placentation’ refers to the arrangement of ovules within the ovary of a flower. It is primarily of 5 types, namely marginal, basal, parietal, axile and free central.