a. A phase of growth which is maximum and fastest is __________.

b. Apical dominance as expressed in dicotyledonous plants is due

to the presence of more ________ in the apical bud than in the

lateral ones.

c. In addition to auxin, a ________ must be supplied to the culture

medium to obtain a good callus in plant tissue culture.

d. ________ of vegetative plants are the sites of photoperiodic

perception

Solution:

a) Log phase or exponential phase.

b) Auxins

c) Cytokinin- kinetin, zeatin, and 6-benzyl amino purine d) Leaves