Which of the following is NOT a component of the Electron Transport System?
Ribosomes are not part of the Electron Transport System; they are involved in protein synthesis. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Botany section), Chapter: Morphology and Anatomy of Flowering Plants, Topic: Plant structure and tissue systems.