2. Influencing the Rate of Photosynthesis

3. Purpose: ­ To find out how the of presence light and the intensity of it contributes to the rate of photosynthesis

4. Hypothesis: Develop Your Hypothesis:  As the light intensity ______ the rate of photosynthesis will _______. (Will their be a certain point where the rate will not increase any more.).

5. Procedure: (use the right arrow key to advance to the next step) 1. Place the elodea in a beaker containing water and also a bit of sodium hydrogen carbonate-NaHCO3- (0.5%). This is put in as it acts as carbon dioxide. 2. Place the beaker next to a lamp 1centimeter away. 3. For one-minute tally/count the number of bubbles produced. 4. Fill in your data on table 1-1 5. After one minute move the lamp 2cm away from the test tube. 6. Repeat steps 3 and 4. 7. Continue this process for the next three minutes at distances of 4, 8, and 16 cm from the test tube. 8. Record all data on table 1-1. 9. Experimental steps 1-7 have been simulated on the next five slides. Advance to the next slide and record you data.

6. Practice counting:

7. 1 cm from the test tube

8. 2 cm from the test tube

9. 4 cm from the test tube

10. 8 cm from the test tube

11. 16 cm from the test tube

12. Now Graph Your Results and answer your analysis Questions.

13. What would happen if we Increased CO2?  By using Sodium Bicarbonate? 2 NaHCO 3 (s)  heat  Na 2 CO 3 (s) + H 2 O(g) + CO 2 (g)(9)

14. Results from actual Lab Group 5cm20cm NaHCO 3 5cm20cm 210.510 367.51180 411.54.515 54513.565 661.5.5

15. Period 3: Results from actual Lab Group 23 456 Class Averages 5cm13.512.52073.51526.9 20cm4.5816.540715.2 5cm NaHCO 3 22.516531122044.7

16. lAB

17. 5 cm from the test tube

18. 20 cm from the test tube

19. 5 cm + Sodium Bicarbonate

20. End for this activity

21. Factors affecting Photosynthetic rates

22. 5cm10cm20cm 5:527:3721:00 10:0911:0121:00 11:3815:0323:35 5:527:4720:00 7:03 6:07 average8:069:3121:51

23. Data Period 1Averages Minutes 5 cm8:06 10 cm9:31 20 cm21.51