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Cactus of South Mountain Park

Cactus of South Mountain Park. Parts of a Saguaro Cactus. Quantitative Observations. Temperature of Cacti in South Mountain Park 5:30 p.m. Cactus #1. Cactus #1. Cactus #2. Cactus #3. Cactus #4. 83.3 F°. Cactus #5. Cactus #6. 83.3 F°. Cactus #7. Cactus #8. Cactus #9.

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Cactus of South Mountain Park

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  1. Cactus of South Mountain Park

  2. Parts of a Saguaro Cactus

  3. Quantitative Observations Temperature of Cacti in South Mountain Park 5:30 p.m.

  4. Cactus #1

  5. Cactus #1

  6. Cactus #2

  7. Cactus #3

  8. Cactus #4 83.3 F°

  9. Cactus #5

  10. Cactus #6 83.3 F°

  11. Cactus #7

  12. Cactus #8

  13. Cactus #9

  14. Qualitative Observations • The cacti do not grow close to each other • The pleats were closer together on the west and east sides of the cactus; the pleats were farther apart on the north and south side • Barrel cactus that were in the sun were almost completely covered in spines • Barrel cactus that were in the shade had very few spines

  15. Observing • Sketch 3 different cacti from today. • Use color. Notice the differences as you sketch. • Write notes as you sketch. • Think as you sketch – Why are the cacti in the shape that they are? • Use the flashlights to model the sun’s rays throughout the day. What do you notice as the sun moves? • Why are they designed that way? • Where do cacti live?

  16. Questions to answer on poster: • What are some of the adaptations that the saguaro cactus has to help it survive the desert heat and low water supply? • What are the 2 functions of the pleats? • What are the 2 functions of the spines? • How does the temperature of the cactus vary when in the shade and in the sun? • How much of the cactus is in the shade at any given time? • Do you think saguaro cacti could live somewhere other than the desert? Why or why not? • Design Challenge: Sketch a bioengineered structure inspired by the cactus that would keep cool in the desert heat.

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