Question

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. none of these.

Answer 1

The correct option is A NAA, $2,4-D$

Plants which are difficult to flower can be made to do so by spraying them with 2,4,-D (2,4, – dichlorophenoxy acetic acid) and NAA (napthalene acetic acid) which are synthetic auxins, e.g., litchi, pineapple. However, some exogenously synthesized auxins, especially 1-naphthaleneacetic acid (NAA) and indole-3-butyric acid (IBA), are also commonly applied to stimulate root growth when taking cuttings of plants or for different agricultural purposes such as the prevention of fruit drop in orchards.

So the correct option is 'NAA, 2,4−D'.