Plants contain the carbohydrates starch and cellulose. in the spring when stem growth is at its fastest rate, cellulose production rates are increased in some plants. in the months with less sunlight, the level of starch decreases in some plants. what does this information demonstrate? a. two functions of carbohydrates are structural support and transferring genetic information. b. carbohydrates are not necessary for plants to grow. c. two functions of carbohydrates are structural support and energy storage. d. plants cannot produce carbohydrates when there is no sunlight.