1. Finish up Excretory System
2. Plant Tissues (P. 172-174,
177-180, 185, 187-188)
1. The long stems of the organ pipe cactus shown above ?store water. Why do you think this would be useful in the ?desert?
2. What is the purpose of the sharp spines around the ?stem?
3. Would you expect the stems of plants found in forests, ?where there is more water available, to have nearly the ?same structure as the organ pipe cactus, or would those ?stems be different?