Nadia Higgins 
Experiment with a Plant’s Roots [PDF ebook] 

Roots help keep plants alive. They take in water and minerals. But do you know how much of a plant is made up of its roots? Or whether roots always grow down? Let’s experiment to find out! Learn more about plants in the Plant Experiments series part of the Lightning Bolt Books collection. With high-energy designs, exciting photos, and fun text, Lightning Bolt Books bring nonfiction topics to life!