Teachers and Students Investigating Plants in Space #11 Phototropism: How Little Light Will Bend a Seedling?
PP. 88-91. With the chamber constructed from activity #10, it is easy to investigate the effects of light quantity on bending of seedlings. Note: This is a 112 page PDF.

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This activity can also be found in:
Quilt: Science Grades: 5-8: N3
Quilt: California Grades: 6-8: K3