Negative feedback regulation of BR biosynthesis involves:
Answer: B) Downregulation of biosynthetic genes. For Brassinosteriod, remember the key idea and you’ll land on this option; the distractors usually swap cause and effect or confuse similar terms. Avoid: A) Increased BR synthesis; C) Inhibition of catabolic genes; D) Activation of BIN2. Name the process first, then pick the option that describes it — don’t reverse cause and effect.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.