The answer is A.
During the process of transpiration the plant sucks the water up through its roots this is a physical change. But, it only goes through a chemical change after the process of photosynthesis because the plant will use sunlight, carbon dioxide, and water and convert it into glucose and oxygen.
The role of grass is the primary producer because it is the beginning of almost every food chain.
It is phototropism. Photosynthesis is the way plants make their food, from light. Notice the photo in both the words, meaning light.
