Discussion: Food Production in Plants

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Discussion: Food Production in Plants

Discussion: Food Production in Plants

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1.

a. What is the name of the pigment that captures light (2 points)

b. Why does the pigment appear green? (2 points)

2. List two variables besides the wavelength (color) of light which might affect the rate of food production in plants. (4 points

a.

b.

.

3. Why is chlorophyll important for all biological life? (5 points)

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)

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)

6. List the four common pigments found in plants and their functions. (4 points)

a.

b.

c.

d.

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)

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 value

b. pigment, Rf value

c. pigment, Rf value

d. pigment, Rf value

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

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

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)

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)

**INFORMATION NEEDED TO COMPLETE THE FOLLOWING PROBLEMS**

Independent Variable: This is the cause.

Dependent Variable: This is the response or effect.

One hundred samples of several different plants were placed in each of six sealed containers with water in them. At the end of two days the amount of oxygen produced was measured. Results are shown in the table below.

Container Plant Height of Plant Light Intensity Source of Light Distance from Light mL O2 Produced
1 Iris 4″ High Artificial 6″ 16
2 Iris 4″ High Natural 6″ 13
3 Iris 6″ Low Artificial 5″ 12
4 Carnation 6″ High Natural 4″ 13
5 Carnation 6″ Low Natural 4″ 9
6 Carnation 4″ Low Artificial 5″ 14

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 2

b. 2 and 3

c. 1 and 5

d. 5 and 6

e. 4 and 5

14. Compare Containers 1 and 2. What independent variable is tested by this comparison? (5 points)

a. Kind of plant

b. Height of plant

c. Light intensity

d. Distance from light source

e. Light source

15. Which container had the slowest rate of photosynthesis? (5 points)

a. 1

b. 2

c. 3

d. 4

e. 5

f. 6

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?

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