Question

Unilocular (one chambered) ovary becomes bilocular (two chambered) due to the formation of false septum is seen in

• A. Pisum and Datura
• B. Primrose and Argemone
• C. Mustard and Argemone
• D. Capsicum and Dianthus

Hint:

False septa form by ingrowths and can change the apparent number of locules — distinguish true septa (carpel margins) from false ones.
Remember common examples (Primula, some Papaveraceae) when asked about false septum.
Sketch the ovary cross-section to visualise true vs false septum formation.

Answer 1

The Correct Option is B

1. A false septum is a partition that divides a unilocular ovary into apparent locules but is not a true septum formed from carpel margins — it often arises by ingrowth from the ovary wall or placenta.
2. In Primrose (Primula) and in some Papaveraceae members such as Argemone, the ovary may show formation of a false septum that makes a unilocular ovary appear bilocular.
3. Pisum (a typical legume) and Datura have different ovary structures and are not classical examples of false septum formation causing conversion from unilocular to bilocular. Capsicum and Dianthus show different placentation/ovary structures as well.
4. Hence, the correct pair where a false septum formation is observed is Primrose and Argemone. Therefore the correct answer is (2) Primrose and Argemone.