Practice question

Positive regulator of photomorphogenesis (B) is correct here. This is core cryptochrome: once you know the definition or pathway step, Positive regulator of photomorphogenesis is the clear fit. The wrong ones are A) Negative regulator of photomorphogenesis; C) Photoreceptor; D) Hormone. If the topic is about gradients or potentials, water/solutes move from higher to lower of the relevant quantity.