You need to use outside sources (i.e., Internet, journal articles, other texts,

Question

You need to

use outside sources (i.e., Internet, journal articles, other texts, etc.) to complete this assignment. Any additional research should be cited in APA format, and listed at the end of the assignment.  

Tutorial: http://www.harcourtschool.com/activity/science_up_close/512/deploy/interface.html Watch and listen to the tutorial found in the link above. Fill in the following answers as you watch. Stop and replay anything you don’t understand – this is a complicated topic!

1. Plants use photosynthesis to make __________________ for the plant.

2. What do plants need in order to perform photosynthesis?

3. How is the plant able to obtain each “ingredient?”

4. Identify the plant cell organelle in which photosynthesis takes place.

5. Summarize the process of photosynthesis. Water and carbon enter the chloroplast…..

6. What happens to the oxygen that is produced as a result of photosynthesis?

7. Why is photosynthesis also important for people and animals?

Virtual Lab #1 - http://www.reading.ac.uk/virtualexperiments/ves/preloader-photosynthesis-full.html

Bubbles are given off by the plant through photosynthesis. By measuring the rate at which the bubbles are produced it is possible to tell how fast the plant is photosynthesizing. Read and follow the directions on how to use this lab simulator. Press start and record the bubbles per minute for each of the following light distances.

Then graph your data (be sure to label each axis)!

Distance (cm) Bubbles per minute

100 Y axis

120 i

150

180

200 X Axis

8. Based on your data, draw a conclusion regarding how light intensity affects the rate of photosynthesis. Virtual Lab #2 - http://www.kscience.co.uk/animations/photolab.swf

In this lab, you will be experimenting with how different variables affect the rate of photosynthesis.

9. Set the thermometer to 25°C (Room Temperature) and the light intensity to 20.

a. What were the bubbles per minute at this setting? ______ bpm

b. Now increase the CO2 available to the elodea. What were your bubbles per minute? ______ bpm

c. Based on your data, how does the amount of available CO2 affect the rate of photosynthesis?

10. Keep your settings from 9c (25°C, light intensity of 20, increased CO2).

a. What were the bubbles per minute at this setting? ______ bpm

b. Now increase the temperature to 40°C. What were your bubbles per minute? ______ bpm

c. Based on your data, how does an increase in temperature affect the rate of photosynthesis?

11. Return to your settings from 9c (25°C, light intensity of 20, increased CO2).

a. What were the bubbles per minute at this setting? ______ bpm

b. Now decrease the temperature to 10°C. What were your bubbles per minute? ______ bpm

c. Based on your data, how does a decrease in temperature affect the rate of photosynthesis.

12. Alter the variables in order to determine which combination leads to the highest rate of photosynthesis. Which combination of settings produced the highest number of bubbles per minute? a. Temperature: ________

b. Light: ________

c. CO2: ________

Photosynthesis Tutorial: http://www.phschool.com/science/biology_place/biocoach/photosynth/overview.html

Use this site to answer questions about photosynthesis.

13. In the blank portion of this paper, draw the picture which shows the overall process of photosynthesis.

14. Write the chemical equation for photosynthesis.

15. Photosynthesis converts _________________ energy into the ____________________ energy of sugars and other organic compounds.

Explanation / Answer

1. to synthesize food

2. carbon dioxide, water, light

4. photosynthesis takes place in chloroplast

5. Carbon dioxide is converted into sugars in a process called carbon fixation; photosynthesis captures energy from sunlight to convert carbon dioxide into carbohydrate. Carbon fixation is an endothermic redox reaction. In general outline, photosynthesis is the opposite of cellular respiration; in the latter, glucose and other compounds are oxidized to produce carbon dioxide and water, and to release chemical energy (an exothermic reaction) to drive the organism's metabolism. The two processes, reduction of carbon dioxide to carbohydrate and then later oxidation of the carbohydrate, are distinct: photosynthesis and cellular respiration take place through a different sequence of chemical reactions and in different cellular compartments.

14. 6CO2 + 6H2O ------> C6H12O6 + 6O2

15. light energy into the chemical

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