2019
| Question 
 [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
 | 
 The scientists from this country discovered a possible "death switch" mechanism in the plant’s immune system that triggers infected cells to self-destruct. 
|  |  Russia 
 | 
|  |  India 
 | 
|  |  China 
 | 
|  |  UK 
 | 
 Explanation: 
 There is 1 question to complete.