In papilionaceous flower the innermost petal unite to form a boat shaped structure called

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alae

wings

vexillum

carina

answer is B.

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Detailed Solution

Papilionaceous corolla has five free petals which resemble the butterfly. The posterior superior petal is larger than the others, two anterior inferior petals are more or less united forming a boat-shaped structure and are called carina or keel, two lateral petals called wings are present.

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