Question

Brassicaceae has ________ placentation
(a) Parietal
(b) Axile
(c) Marginal
(d) None of the above

Answer 1

 
Hint: Brassicaceae is a family of the flowering plants which are medium-sized and economically important and include plants such as mustard, cabbage, crucifers, etc. In these plants, there is a formation of a false septum called replum and the ovules develop on the wall or slightly outwards.

Complete Step by Step Answer:
In botany, the term placentation refers to the different arrangements of ovules inside the ovary. Parietal placentation is seen in the Brassicaceae family in which the ovules develop either on the inner wall of the ovary or on a peripheral part of the ovary.

 Additional Information: The ovules inside the ovary of a flower become the seeds inside the fruits. They are attached via a funiculus which is the plant part equivalent to an umbilical cord and the part of the ovary where the funiculus attaches is called the placenta. Placentation can be of various types namely Basal, Parietal, Axile, Free central, and Marginal.
Axile placentation is seen in tomato, lemon, etc in which the ovules are attached to a central axis inside a multilocular ovary.
Marginal placentation is found in pea, gram, etc., where the placenta forms a ridge ventral suture of the ovary and the ovules are attached on the ridge to form two rows.
So, the correct answer is, “Parietal”.

Note:
- Parietal placentation is found in the bicarpellary to multicarpellary syncarpous ovary. Though the family Brassicaceae has a unilocular ovule, it becomes bilocular due to the development of a false septum called the replum.
- This replum is a characteristic feature of the family Brassicaceae.