Fill in the places with appropriate word/words.
1. A phase of growth which is the maximum and fastest is .....
2. Apical dominance as expressed in dicotyledonous plants is due to the presence of more ...... in the apical bud than in the lateral ones.
3. In addition to auxin, ..... must be supplied to culture medium to obtain a good callus in plant tissue culture.
4. .......... of vegetative plants are the sites of photoperiodic perception.
