Subject: Biology    / General Biology

1. a. What is the name of the pigment that captures light? (2 points) b. Why does the pigment appear green? (2 points)–Answer below:

2. List two variables besides the wavelength (color) of light which might affect the rate of food production in plants. (4 points)a.b.–Answer below:

3. Why is chlorophyll important for all biological life? (5 points)–Answer below:

4. a. In Part I of the procedure, what is the name of the indicator used to identify the presence of CO2? (2 points) b. What color did the indicator turn after blowing air into the water through the straw? (2 points)–Answer below:

5. a. What color did the indicator turn after the tube was placed under a light source for 30 minutes? (2 points) b. Why did this occur? (3 points)–Answer below:

6. List the four common pigments found in plants and their functions. (4 points)a.b.c.d.–Answer below:

7. If the Rf factor of a pigment is .8400 and the distance that the solvent traveled is 12 cm, how far did the pigment travel? (5 points)–Answer below:

8. List the pigments extracted from the spinach leaves and their corresponding Rf values, from lowest to highest Rf value (4 points). a. pigment, Rf valueb. pigment, Rf valuec. pigment, Rf valued. pigment, Rf value–Answer below:

9. Based on the results, which pigment has the highest molecular weight? (5 points)–Answer below:

10. From the chromatography lab, which pigments were soluble in the acetone? (5 points)–Answer below:

11. The earth’s early atmosphere did not contain oxygen. This changed dramatically once the early cells underwent photosynthesis. Explain why photosynthesis could have occurred in such an atmosphere and how it eventually affected the evolution of other organisms. (10 points)–Answer below:

12. a. In reviewing the data from the floating disk experiment, which factor had a greater impact on the rate of photosynthesis (light intensity or concentration of carbon dioxide)? (5 points)b. How did the student come to this conclusion? (5 points)–Answer below:

13. Based on the data presented in the table, which two containers could be correctly used to compare the rate of photosynthesis at two different light intensities? (5 points)a. 1 and 2b. 2 and 3c. 1 and 5d. 5 and 6e. 4 and 5–Answer below

14. Compare Containers 1 and 2. What independent variable is tested by this comparison? (5 points)a. Kind of plantb. Height of plantc. Light intensityd. Distance from light sourcee. Light source–Answer below:

15. Which container had the slowest rate of photosynthesis? (5 points)a. 1 b. 2 c. 3 d. 4 e. 5 f. 6–Answer below

16. (Application) How might the information gained from this lab pertaining to photosynthesis and pigments be useful to the student or how can the student apply this knowledge to everyday life as a non-scientist? (20 points)–Answer below:

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