The study looked at how different amounts of cadmium affected the leaves of Cajanus cajan plants. They found that as the cadmium levels increased, the plants had fewer and smaller stomata on their leaves, which are important for breathing. The plants also had lower rates of photosynthesis, which is how they make food, and lower levels of chlorophyll and other pigments that help them absorb sunlight. Overall, the cadmium made the plants less healthy and less able to grow properly.