Preparing for the Respiration Lab
Many people define respiration
incorrectly….
What is the actual definition?
Respiration applies to three distinct but interrelated
processes…..
1.
2.
The active acquisition
of oxygen by an
organism.
The release of energy through
the breakdown of organic
compounds by chemical
reactions.
3.
The production of Carbon
Dioxide and water.
2
ATP
A poikilotherm is an animal who’s body temperature fluctuates with the changes in
the surrounding temperature.
Reptiles are a common example of this type of ectotherm.
If you have ever seen a lizard or snake in the early morning when the air and
ground are cool, you may have noticed how slowly they move. They move slowly
when the environment is cold because they require heat from their surroundings to
increase their internal temperature and metabolism.
Once their internal body temperature has warmed, they can metabolize foods more
quickly and produce the energy they need. Aerobic respiration is the process of
metabolism where sugars are broken down in the presence of Oxygen.
This type of cellular respiration yields ATP, carbon dioxide, and water.
Your task today:
Create a lab plan for testing the affects of temperature on the rate of cellular respiration.
Think- How can you measure the rate of respiration?
What could you use?
How would you incorporate temperature as an independent variable?
The objectives for this activity:
1. Some AP Free Response questions have been about designing a lab to test a
particular variable. This will serve as a practice for setting up a free response
outline.
2. To supplement your unit on Cellular Respiration, thinking of the reactants, products,
and factors that can affect the rate.
3. Review parts of Experimental Design.
Treat this assignment as if it were given to you as a free response and you are
preparing your outline and key points. Fill in your sheet. We will go over this
together. Take this assignment seriously, as if you were asked to create a real,
ethical lab.
In our respiration lab this Friday we will be measuring the
amount of carbon dioxide produced in germinating peas.
-We will use the lab pro equipment and a CO2 sensor.
-We will quantify and graph the effects of temperature on the rate of
respiration in plants.
-We will demonstrate the relationship between independent and dependent
variables
-We will compare the rates of cellular respiration in germinating and nongerminating peas.
-READ THE BACKGROUND READ AND HAVE YOUR
TITLE, PURPOSE, PROCEDURE STEPS, AND EMPTY
DATA TABLE READY TO GO WHEN YOU WALK IN…..