Cabbage stores food in its leaves. The leaves of the cabbage plant contain chloroplasts, which are responsible for photosynthesis. During photosynthesis, the leaves produce glucose, which is a form of sugar and the main source of energy for the plant. The glucose is stored in the leaves as starch, which provides the plant with a reserve of food. This stored food in the leaves is then used by the plant when it needs energy for growth, reproduction, and other metabolic processes. The other options presented in the question are incorrect. The stem of the cabbage primarily serves as a support structure, while the fruit of the cabbage is the swollen part that contains the seeds. The root of the cabbage is mainly responsible for absorbing water and nutrients from the soil.