NEET · Biology · STD 11 - 5. Morphology flowering plants

Keel is the characteristic feature of flower of

A Aloe
B tomato
C tulip
D Indigofera.

Verified Solution

Answer & Solution

Correct Answer

(D) Indigofera.

Step-by-step Solution

Detailed explanation

(d) : The flowers of Family Papilionaceae have butterfly shaped corolla (papilionaceous corolla). Posterior or outermost petal is the largest and is called standard or vexillum, two lateral petals are similar and generally clawed, are called wings or alae and the two anterior petals called keel are fused enclosing stamens and carpels. This type of petal arrangement is found in bean, gram, pea, Indigofera etc.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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List \(I\)	List \(II\)
\(A\). Rhizopus	\(I\). Mushroom
\(B\). Ustilago	\(II\). Smut fungus
\(C\). Puccinia	\(III\). Bread mould
\(D\). Agaricus	\(IV\). Rust fungus