Keel is characteristic of the flowers of
- gulmohur
- Cassia
- Calotropis
- bean
Answer
(4) bean
Solution
As per NCERT, pea and bean flowers (family Fabaceae) have vexillary aestivation: five petals — a large posterior standard, two lateral wings and two smallest anterior petals that fuse to form the keel.
∵ Gulmohur and Cassia have imbricate aestivation (no keel) and Calotropis has valvate aestivation,
∴ keel is characteristic of bean flowers.
Answer: (4)