Conversion of OPDA to jasmonic acid occurs in:
Pick C: Peroxisome. Thinking through Jasmonic acid step by step rules out the lookalikes and leaves Peroxisome. Skip these: A) Chloroplast; B) Cytosol; D) Nucleus. For hormones and genes, match the molecule or gene to its real role, not a neighboring pathway.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.