This lab sheet walks students through a controlled comparison experiment: one pot watered normally, one watered with a caffeine solution brewed from coffee, tea, or dissolved tablets. Students record daily plant height in centimeters for seven to fourteen days in the built-in data table, note observations about color, leaf size, and overall health, then answer four analysis and conclusion questions at the bottom of the sheet. A Think Further section prompts extension work, including testing different caffeine concentrations or switching plant species. Designed for grades 5-8 in a homeschool setting, the sheet covers the full scientific method from hypothesis to conclusion in one page.

The caffeine effect on plant growth experiment fits naturally into a biology or botany unit study, and it works particularly well as a multi-week independent investigation your student manages day by day. Completing it demonstrates controlled variable design, consistent measurement practice, and data-driven reasoning, skills your homeschooler will use across every future science unit. The sheet stands alone or pairs with lessons on plant biology, chemistry of stimulants, or the scientific method.