Cells, tissues, and organs of plants are grown in aseptic solid or liquid media. Commercial micro propagation is used to quickly multiply system cuts, axillary buds, somatic embryos, cell clumps in suspension cultures, and bioreactors. Agriculture, horticulture, forestry, and breeding are all fields that use plant tissue culture. Applied biotechnology is used for mass propagation, getting rid of viruses, making secondary metabolites, and cloning plants in a lab. Some endangered plant species have been saved by freezing them for a long time and letting them grow slowly for a short or medium amount of time. These methods are better than other ways to save plant species with seeds that are resistant or dormant.