5.Place the beaker setup in a well-lit area
near a lamp or in direct sunlight.
6.Record that there was 0mm gas in the test
tube on day 0. (If you were unable to place
the test tube without getting air in the tube,
measure the height of the column of air in
the test tube in millimeters. Record this
value for day 0.) In this lab, change in gas
volume is indicated by a linear measure-
ment expressed in millimeters.
7.For days 1 through 5, measure the amount
of gas in the test tube. Record the measure-
ments in your data table under the head-
ing, “Total amount of gas present (mm).”
8.Calculate the amount of gas produced each
day by subtracting the amount of gas pre-
sent on the previous day from the amount
of gas present today. Record these amounts
under the heading, “Amount of gas pro-
duced per day (mm).”
9.Plot the data from your table on a graph.
Analyze and Conclude
- Summarizing Results Using information
from you graph, describe what happened
to the amount of gas in the test tube. - Analyzing DataHow much gas was pro-
duced in the test tube after day 5? - Drawing Conclusions Write the equa-
tion for photosynthesis. Explain each part
of the equation. For example, what ingredi-
ents are necessary for photosynthesis to
take place? What substances are produced
by photosynthesis? What gas is produced
that we need in order to live? - Predicting PatternsWhat may happen
to the oxygen level if an animal, such as a
snail, were put in the beaker with the
Elodeasprig while the Elodeasprig was
making oxygen? - Further Inquiry Write a new question
about photosynthesis that could be
explored with another investigation.
http://www.scilinks.org
Topic:Photosynthesis
Keyword:HX4136CHAPTER 5Photosynthesis and Respiration 115
Do You Know?
Do research in the library or media center
to answer these questions:
1.What is hydroponic farming?
2.How do coral reefs depend on
photosynthesis?
Use the following Internet resources
to explore your own questions about
photosynthesis.