Students examine how photosynthetic rates can change by using different qualities of light. They practice using spectrophotometer and the scientific method to detect the absorbance values in light treatments.

Seventh graders discuss the role of plants on Earth's biological system. In this life science instructional activity, 7th graders explain the process of transpiration and its importance in establishing Earth's climate patterns.

Pupils observe changes in a selected tree leaf near their homes during the fall. Twice each week students record changes in the leaf using words, pictures, and numbers.