Callus and cancer cells both are undifferentiated masses of cells formed by rapid mitosis. They differ as
Callus cells can differentiate while cancer cells cannot
Cancer cells can differentiate in a specific medium but callus cells never do so
Callus is abnormal while cancer is always benign
Both cannot be differentiated
While both callus cells and cancer cells are undifferentiated masses of cells formed by rapid mitosis, callus cells have the capacity to differentiate into various cell types and ultimately form functional tissues or whole plants, whereas cancer cells are unable to properly differentiate, resulting in the formation of malignant tumors. Hence, the correct answer is option 1.