NEET · Biology · STD 11 - 13. Plant growth and development

The pineapple which under natural condition is difficult to blossom has been made to produce fruits throughout the year by application of

A \(NAA, 2, 4-D\)
B Phenyl acetic acid
C Cytokinin
D \(IAA, IBA\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(NAA, 2, 4-D\)

Step-by-step Solution

Detailed explanation

(a) : \(NAA\) (\(\alpha\)-Naphthalene acetic acid) and \(2,4\ D-(2, 4\) dichlorophenoxy acetic acid) are synthetic auxins. Normally, auxins inhibit flowering. In lettuce, it delays flowering and the plants can be kept in their vegetative phase for longer periods of time. In litchi and pineapple, however, application of auxin promotes flowering.

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.

Same subject

Match List \(I\) with List \(II\) :

List \(I\)	List \(II\)
\(A.\) \(\alpha-I\) antitrypsin	\(I.\) Cotton bollworm
\(B.\) Cry \(\mathrm{IAb}\)	\(II.\) \(ADA\) deficiency
\(C.\) Cry IAc	\(III.\) Emphysema
\(D.\) Enzyme replacement therapy	\(IV.\) Corn borer

Choose the correct answer form the options given below:

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