How many types of plant tissue culture are there?

Which growth regulator is added to the medium in suspension culture?

In the suspension culture method,how are the cell aggregates maintained in the liquid medium?

Which of the following is used as an explant in tissue culture?

In the initial stages of protoplast culture,sorbitol or mannitol is added:

In tissue culture experiments using tobacco callus,it was observed that when the culture medium contains $2 \ ppm$ of $IAA$ and $2 \ ppm$ of kinetin,an undifferentiated mass of callus is produced. If the ratio of kinetin to $IAA$ is increased,what will happen?