Explanation:

 Concept: Plant tissue culture relies on the fact that many plant cells have the ability to regenerate a whole plant (totipotency). Single cells, plant cells without cell walls (protoplasts), pieces of leaves, stems or roots can often be used to generate a new plant on culture media given the required nutrients and plant hormones.
Justification: It is a collection of techniques used to maintain or grow plant cells, tissues or organs under sterile conditions on a nutrient culture medium of known composition. Plant tissue culture is widely used to produce clones of a plant in a method known as micro-propagation. Different techniques in plant tissue culture may offer certain advantages over traditional methods of propagation, including:
? The production of exact copies of plants that produce particularly good flowers, fruits, or have other desirable traits.
? To quickly produce mature plants.
? The production of multiples of plants in the absence of seeds or necessary pollinators to produce seeds.
? The regeneration of whole plants from plant cells that have been genetically modified.
? The production of plants in sterile containers that allows them to be moved with greatly reduced chances of transmitting diseases, pests, and pathogens.
? The production of plants from seeds that otherwise have very low chances of germinating and growing, i.e.: orchids and Nepenthes.
? To clear particular plants of viral and other infections and to quickly multiply these plants as 'cleaned stock' for horticulture and agriculture.