Which of the following is not a mechanism of plant disease resistance at the molecular level?

Correct option is D

Phagocytosis of pathogens by plant cells is not a mechanism of plant disease resistance at the molecular level. Plants do not perform phagocytosis like animals. Instead, plants use mechanisms such as the production of antimicrobial proteins, hypersensitive responses, and the activation of phytohormones to defend against pathogens.