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	90 Directed Inquiry Explore What color can come from leaves? 92 How to Read Science Cause and Effect 93    You Are There! 94    Lesson 1 How do leaves help a plant? 95    Lesson 2 How do stems and roots help a plant? 98    Lesson 3 How do plants reproduce? 102    Lesson 4 How do plants grow? 110 Guided Inquiry Investigate Does the direction seeds are planted affect the direction the roots grow? 114    Comparing Plant Growth 116   Chapter 4 Review and Test Prep 118    Plant Physiologist 120