In low light intensity, chloroplasts show:
Pick B: Accumulation response. Thinking through Phototropin+All step by step rules out the lookalikes and leaves Accumulation response. Skip these: A) Avoidance response; C) No movement; D) Random movement. 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.