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Morphology of Flowering Plants
Question
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Keel is the characteristic feature of flower of

  • Tulip

  • Indigofera

  • Aloe

  • Tomato

Answer

B.

Indigofera

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.

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