Plant reproduction by tissue culture differs from reproduction by meristem culture because a. tissue culture requires cells from a plant's root system, whereas any cell of a plant may be used for meristem culture. b. tissue culture propagation produces clonal plants, whereas meristem culture produces plants that may be genetically different. c. tissue culture produces plants that are virus-free, whereas plants produced by meristem culture may not be virus-free. d. plants produced by meristem culture are clones, whereas tissue culture does not produce genetically identical plants.