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

1. IAA, IBA
2. NAA, 2, 4-D
3. Phenyl acetic acid
4. Cytokinin

Correct answer: NAA, 2, 4-D

Solution

NAA and 2,4-D are synthetic auxins. Auxins are used in horticulture to promote fruit set and induce parthenocarpic fruit development, helping pineapple produce fruits more regularly.

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