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  4. The pine apple which under normal conditions is difficult to blossom has been made to produce fruits throughout the year by the application of

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Q. The pine apple which under normal conditions is difficult to blossom has been made to produce fruits throughout the year by the application of

WBJEEWBJEE 2007Plant Growth and Development

Solution:

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.