Auxin and Cytokinin Concentrations

Q.

Are all plants totipotent?

Q. Callus can form shoot or root by changing ratio of

1. auxin to gibberellin
2. auxin to cytokinin
3. cytokinin to ethylene
   
4. gibberellin to cytokinin

Q. Shoot bud formation in tissue culture is promoted by

1. high auxin : low cytokinin
2. low auxin : high cytokinin
3. auxin : sucrose
4. $G{A}_3$ : cytokinin