Both a chloroplast and a vacuole are enclosed by membranes, but the two organelles serve different functions. Which of the following best describes how a chloroplast is different from a vacuole? A : A chloroplast transforms water energy, and a vacuole stores water energy .B. A chloroplast excretes waste, and a vacuole stores water energy. C. A chloroplast excretes light energy, and a vacuole stores light energy. D .A chloroplast transforms light energy, and a vacuole stores water and other substances.