Final answer:
The leaves of a plant contain the most starch after a period of bright light.
Step-by-step explanation:
The section of the plant that contains the most starch after a period of bright light is the leaves.
Leaves are the main site of photosynthesis in plants and are responsible for producing glucose through the process of photosynthesis. Excess glucose is converted into starch and stored in the leaves for future use.
During periods of bright light, photosynthesis is at its peak, resulting in a higher production of glucose and consequently more starch accumulation in the leaves.