5.17 describe the process of micropropagation (tissue culture) in which small pieces of plants (explants) are grown in vitro using nutrient media

Plant clippings are taken and placed in a sterile growth medium. Roots will develop from the clipping (and shoots) making a whole new plant. The plant will then be transferred into compost and grown as a normal plant.
The plant is a clone of the one is was taken from because it has the same DNA. This means that there will be no variation, so you can have the same plant every time.