question_answer 25)

  A primary root grows from 5 cm to 19 cm in a week. Calculate the growth rate and relative growth rate over the period.

Answer:

                (a) Gibberellic acid increases the yield of sugarcane. (b) Cytokinin spray on plants promote lateral shoot growth. (c) The effect of ethylene on potato causes its sprouting. (d) ABA - Abscissic acid inhibit the seed germination.