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Do Plants Need Light?

Author(s): Nancy Moreno, PhD, and Barbara Tharp, MS.

Session 3: Light Experiment

When most of the seedlings are approximately 10 cm tall, explain to students that they will now investigate the effect of light on bean plant growth. Ask, What do you think will happen if we give some of the plants less light? 

Have each group move pots 3 and 4 to a new location, away from windows or a light source (you may want to select the back of the classroom or a dark corner). Ask, Do you think the plants moved to this new place will receive as much light as the others? Why or why not? What do you think will happen to the plants that receive less light? 

Have students discuss and predict possible outcomes. Students should continue to measure their plants for another 3–5 days and record the measurements on their “Just Growing Up” sheets. 


Funded by the following grant(s)

National Institute of Environmental Health Sciences, NIH

National Institute of Environmental Health Sciences, NIH

My Health My World: National Dissemination
Grant Number: 5R25ES009259
The Environment as a Context for Opportunities in Schools
Grant Number: 5R25ES010698, R25ES06932