Structured for grades 5-7, this lab walks students through a controlled comparison between a no-stress plant and one subjected to a chosen stressor, such as reduced water, excess water, low light, physical damage, or salty soil. Students write a hypothesis, identify independent and dependent variables, measure plant height in centimeters each day for up to ten days, and log daily observations about color changes, drooping, or other visible differences. The data table holds columns for a control plant, a primary stress plant, and an optional second stress type so your homeschooler can extend the experiment without redesigning the sheet.

The effect of stress on plant growth is a natural fit inside a botany unit study or a broader environmental science sequence. Completed alone, it demonstrates experimental design skills including variable control and data collection. As part of a sequence, it pairs well with soil pH or fertilizer experiments already in your curriculum. The conclusion section pushes students past observation by asking what the results reveal about how stress affects plants and whether the original hypothesis held up, moving them from recording facts to building an argument.