What are the Effects of Light Intensity on the Rate of Photosynthesis and Oxygen Production in Plants? (page 2)
- What isPhotosynthesis?
- During process of sugar production in this project carbon dioxide combines with water to form glucose sugar and what gas is released?
- Would this investigation have worked if a light source was not present?
- Does distance (intensity) of light from the planet increase the rate oxygen production?
Terms, Concepts and Questions to Start Background Research
Photosynthesis, chlorophyll, oxygen
- Get a sprig of elodea. Remove several leaves from around the cut end of the stem. Slice off a portion of the stem at an angle and lightly crush the cut end of the stem.
- Place the plant under the funnel as shown and filled with water. Add a pinch of baking soda powder to the test tube. Then fill the test tube with water and place on top of the funnel as shown in figure 1 make sure there is no air in the test tube.
- Place this set-up in a darken room or closet for several hours, after the set time period has pasted check to see if gas has collected in the test tube.
- Next, place a light source 5 cm from the plant. After one minute, count and record the number of oxygen bubbles rising from the cut end of the stem. Count bubbles seen for five minutes.
- Move the lamp so it is 10 cm from the plant. After one minute count and record bubbles for five-minutes. Repeat the same procedure, but this time move the light source 15 cm away and count the bubbles seen. Record the results.
- Light a thin piece of wood with a match, and blow out the flame. Remove the test tube, invert it, and insert the glowing wooden splint into the test tube as shown to the left. Note any evidence of it re-lighting.
Distance of light source
Number of bubbles
- Using graph paper or a computer equipped with Excel® visually display the data in the table by plotting a bar or line graph showing the rate of oxygen production along the vertical (Y) axis verses the distance of the light source along the horizontal (X) axis.
Title: Photosynthesis, Authors: David O. Hall and Krishna Rao, Publisher: Cambridge University Press, ISBN-10: 0521644976 ISBN-13: 978-0521644976
- The Production of Oxygen in Photosynthesis http://www.jgsee.kmutt.ac.th/exell/JEE613/WriteExptExample.html
- Types of Photosynthesis http://wc.pima.edu/Bfiero/tucsonecology/plants/plants_photosynthesis.htm
Note: The Internet is dynamic; websites cited are subject to change without warning or notice!
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