The growth of a plant toward light is an example of response. This response is called phototropism. Thegrowth of plant parts towards light is phototropism. Growth towards light is positive phototropism,example growth ofstem towards light. Growth away from light is negative phototropism, example, growth of roots.
Vitamin a stays accumulated in your system and so only a concern if Greg is vitamin a deficient but he is probably getting other sources of vit a in his diet as well
