Final answer:
Increased light exposure will lead to higher rates of photosynthesis in the water plant.
Step-by-step explanation:
The hypothesis for this practical investigation is:
A. Increased light exposure will lead to higher rates of photosynthesis in the water plant.
The hypothesis suggests that when the water plant is exposed to more light, the rate of photosynthesis will increase. This is because light is one of the main factors that drives photosynthesis. By increasing the light exposure, the plant will have more energy to convert carbon dioxide and water into glucose and oxygen through the process of photosynthesis.