Question

In the unilocular ovary the ovules develop on the inner wall of the ovary. Placentation can be
A.Basal
B.Axile
C.Parietal
D.Free central

Answer 1

Hint: Ovary is a part of the female reproductive system of plants. It consists of ovules that upon fertilization turns into seeds whereas the ovary itself develops into fruit.

Complete answer:
Placentation is plants refers to the attachment of the ovules inside the ovary. The plant also comprises an organ similar to the umbilical cord of animals, this organ is known as funiculi and the ovules are attached via this to the ovary. The region of the ovary where the funiculus attaches is known as the placenta. Placenta are of various different kinds- basal, parietal, axile, free central and marginal. The basal placentation is found in mono to multicarpellary syncarpous ovary where usually a single ovule is attached at the base. Examples include Helianthus. parietal placentation is found in bicarpellary to multicarpellary syncarpous ovary where the unilocular ovary turns into bilocular due to false septum formation. Examples include Cucumber. Axile placentation is found in bicarpellary to multicarpellary syncarpous ovary where the carpels fuse leading to the formation of a septa that forms a central axis where ovules are arranged. Examples include Hibiscus. Free central placentation is found in the bicarpellary to multicarpellary ovary where ovules are arranged on a central axis. Examples include Primroses. Marginal placentation is found in monocarpellary unilocular ovaries where ovules are arranged in two vertical rows. Examples include Pea plant.

Hence, the correct answer is option (A)

Note: The knowledge about placentation is important as it helps us to get an idea about the arrangement of the ovules inside the ovary which are important components of the flowering plants which in turn gives us an idea of development of fruits in plants.