1. How are plant viruses isolated from the host plant? 2. Give a list of the angiospermic families and their representative host plants that are commonly used for propagating a
virus. 3. Explain the procedures used for identification of a plant virus. 4. Write notes on the following:
(a) Extraction medium
(b) Clarification
(c) Storage of virus inoculum
(d) Plant virus purification
5. Describe the following symptoms caused by plant viruses: (a) Ring spotting (c) Leaf roll
(b) Dwarfing (d) Flower breaking
6. How are the plant viruses translocated and distributed in the plant?
7. Distinguish between the following:
(a) Necrosis and chlorosis
(b) Hypoplasia and hyperplasia
(c) Atrophy and hypertrophy
(d) Shoe-string and enation