Which of the following part of the plant should be excluded for the study of Viral effects?

Answer: Option B

Shoot apex is the part of the plant that should be excluded from the study of Viral effects.
The shoot apex is the growing tip of the plant shoot and has a crucial role in morphogenesis, this is where new leaves or flowers emerge and rapidly expand.
The apex meristem maintains a balance between the self-renewal of a reservoir of central stem cells and organ initiation from peripheral cells.
Since these cells have very high metabolic rates, it is difficult for the cells to be used for viral studies.