Question

Pormalin is sprayed over the apple to increase fruit size, it is
(a) Auxin
(b) Mixture of auxin and gibberellin
(c) Mixture of auxin and cytokinin
(d) Mixture of cytokinin and gibberellin

Answer 1

Hint: Promalin, a regulator for plant growth, consists of two components. One is responsible for the division of cells in plant roots and shoots, and the other is responsible for controlling many processes of growth, such as stem elongation.

Complete answer:
Promalin is a combination of gibberellin and cytokinin that is sprayed over apples to increase their size. It's an efficient enlargement of the apple. Gibberellins help to cause the bulk size to increase, while cytokinins increase the fruit size as a result of cell division.
Promalin strengthens the form and increases the size of tasty red apples. Promalin, through the elongation of fruit and the development of more prominent calyx lobes, improves the weight and size of the fruit.
Depending on when it is administered, Promalin has a variety of effects on apples. During flowering, it enhances the shape of the fruit, rendering apples elongated. Pormalin increases fruit size and finish (russet control) , applied from late boom to 40 days after bloom. Promalin, used after frost incidents, will set up fruit that would otherwise fall off. Finally, in nursery trees, Promalin improves branching.
So, the correct answer is, ‘Mixture of cytokinin and gibberellin’.

Note: Cytokinins are a group of plant growth substances (phytohormones) which promote cell division, or cytokinesis, in plant roots and shoots. They are mainly involved in the growth and differentiation of cells, but also influence apical dominance, growth of axillary buds, and leaf senescence. The plant hormones which control various development processes are gibberellins. They are stem elongation, germination, dormancy, flowering, leaf and fruit senescence, and flower formation. One of the longest-known plant hormone groups is gibberellins.