5.17B describe the process of micropropagation (tissue culture) in which explants are grown in vitro

Micropropagation: a method used to produce a large number of identical plants from a selected stock

Process:
1. a plant tissue (called explants) is selected and sterilized.
2. the explant is grown in vitro: a petri dish containing nutrient agar gel and growth hormones (auxins)
3. the cells in the explants divide and grow into a small plant. Further explants can be taken from this small plant to grow more plants.
4. the small plants are taken out of the medium and planted into soil in glasshouses, where they'll develop into plants that are genetically identical to the original plant.