In light conditions, COP1 is predominantly localized in the:
Correct option is B, Cytosol. In PSS-Sec-E-Sensory biology problems like this, the accurate statement is Cytosol; the others are common mix-ups. Not these: A) Nucleus; C) Chloroplast; D) Mitochondria. Tissue transport questions usually turn on xylem vs phloem, living vs dead cells, or source vs sink.
Ref: Best CSIR NET Plant Physiology books: Master Unit 6 with Taiz & Zeiger and Salisbury & Ross. Crack Part C experimental questions with top textbooks.