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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.
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Ans : (a) NAA, 2, 4-D

Explanation :

NAA (a-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.

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