Many plants such as orchids are grown by technique called tissue culture. small pieces of plant tissue from a left, stem, or roots of a mature plants are placed in a medium that contains the proper nutrients. the cells first form a mass of undifferentiated cells, from which tiny roots, stems, and leaves eventually grow. how do the plant cells placed in a medium for tissue culture change in terms of their degree of specialization? what types of animal cells are most similar to the undifferentiated plant cells in a tissue culture?