A crop mprovement practice where varieties of crops with desirable qualities are imported to a new area is

In crop improvement, introduction is the practice of bringing crop varieties or species from one geographical area (where they naturally occur or have been developed) into a new area where they have not previously been grown. The aim is to take advantage of desirable qualities such as higher yield, disease resistance, or better adaptation to specific conditions.

Introduction is one of the simplest and oldest methods of crop improvement. When an introduced variety performs well in its new environment, it may be adopted directly by farmers. If it does not perform well on its own but carries useful traits, it can be used as parent material in breeding programmes.

Selection involves choosing the best-performing individual plants from an existing population for propagation. Hybridisation is the deliberate cross-pollination of two genetically different parent plants to combine their desirable traits in the offspring. Quarantine (misspelled as "guarantine" in the option) is a regulatory measure to prevent the spread of pests and diseases when plant material is moved between regions - it is a biosecurity practice, not a crop improvement method.