Final answer:
Yes, plant viruses can be cultivated and purified, but it is not always easy.
Step-by-step explanation:
Plant viruses can be cultivated and purified, but the process is not always easy. Cultivation of viruses requires the presence of a host cell, either a whole organism, embryo, or cell culture. In vitro cultivation, which is outside a living organism, is commonly done in flat horizontal cell culture flasks. Purification of viruses can be achieved by separating them from the host cells through centrifugation or filtration.