Answer:

Correct Answer: B

Solution:

• Keel is petal is vexillary aestivation, which is a characteristic of family-Fabaceae, i.e Indigofera tomato belongs to family-Solanaceae, tulip and while aloe to Liliaceae. Papilionaceae (e.g. Indigofera, pea) is sub-family of Fabaceae, which has bilateral symmetry with, corolla consist of 5 petals. It follows vexillary aestivation. A single upper posterior petal is known as banner. Two lateral compressed petals called wings and a pair of anterior small fused petal forms keel. Keel has concave sides which make them fused at bases, Hence, keel is the characteristic feature of flower of family-Papilionaceae, e.g. Indigofera.