(a) Disease-causing organism: Ranikhet disease is caused by the Newcastle Disease Virus (NDV).
(b) Commonly Found in: It affects poultry birds such as chickens, ducks, and turkeys.
(c) One symptom: Birds infected with Ranikhet disease show respiratory distress, coughing, and sneezing. Neurological symptoms like twisted necks may also occur.
(d) One control measure: Vaccination is the most effective measure to prevent Ranikhet disease in poultry. Proper sanitation and biosecurity measures should also be maintained.
| Case No. | Lens | Focal Length | Object Distance |
|---|---|---|---|
| 1 | \(A\) | 50 cm | 25 cm |
| 2 | B | 20 cm | 60 cm |
| 3 | C | 15 cm | 30 cm |