Keel is the characteristic feature of the flower of
Indigofera
The correct option is B:
Explanation for correct option:
Explanation for incorrect options:
Option A:
Aloe is a succulent plant that belongs to the Asphodelaceae family.
Option C:
Tulip belongs to the Liliaceae family and is a spring-blooming herbaceous plant.
Option D:
The tomato is an edible berry of the Solanum family.
Final answer: Keel is the characteristic feature of the Indigofera flower.