Topping sesame plants helps them use light and water more efficiently. By cutting off the tops of the plants, the leaves control how much water they release, which makes them better at turning sunlight into energy. After topping, the plants had lower water loss and higher photosynthesis rates. Middle and lower leaves did better than upper leaves after topping. This means that topping can improve how sesame plants grow and make them more efficient at using resources like sunlight and water.