Define the following terms:
(a) Aestivation
(b) Placentation
(c) Actinomorphic
(d) Zygomorphic
(e) Superior ovary
(f) Perigynous flower
(g) Epipetalous Stamen

Explanation

(a) Aestivation. It is the arrangement of petals in a flower bud in respect to one another.
(b) Placentation. It is the mode of arrangement of placentae or ovules bearing cushion of parenchymatous cells within the ovary.
(c) Actinomorphic. Here flower can be divided into two similar vertical halves in more than one plane e.g. Petunia.
(d) Zygomorphic. Here flower can be divided into similar two vertical halves only in one plane e.g. pea.
(e) Superior ovary. When the various whorls of a flower are arranged below the ovary, the carpel occupies the central position and other floral parts are borne below it, here ovary is said to be superior and .flower is called hypogynous.
(f) Perigynous flower. If gynoecium is situated in the centre and other parts of the flower are located on the rim of thalamus almost at the same level, it is called perigynous flower e.g. plum.
(g) Epipetalous stemen. When the stamens are attached to petals, condition is called epipetalous e.g. Petunia, Brinjal.