2.37: Describe Experiments to Investigate the Evolution of Carbon Dioxide and Heat from Respiring Seeds or Other Suitable Living Organisms

INVESTIGATING EVOLUTION OF CARBON DIOXIDE

Using Respiring Organisms to Investigate the Production of Carbon Dioxide

METHOD: Capillary Tube is Connected from the Air (Inlet Pipe) into a Flask of Sodium Hydroxide This Flask is Connected by a Capillary Tube to a Flask of Hydrogen Carbonate Indicator A This Flask is Connected by a Capillary Tube to a Flask of Respiring Organisms (In this Diagram, Worms) This Flask is Connected by a Capillary Tube to a Flask of Hydrogen Carbonate Indicator B Finally, This Flask is Connected by a Capillary Tube to the air as an Exit Pipe

RESULT: As Air Enters the First Capillary Tube, Carbon Dioxide in the Air will be Absorbed by the Sodium Hydroxide, causing the Hydrogen Carbonate Indicator A to turn Red (Atmospheric Level) The Flask of Respiring Organisms will Respire Aerobically, Producing Carbon Dioxide as a Waste Product, causing the Hydrogen Carbonate Indicator B to turn Yellow (High Levels of Carbon Dioxide) This shows the Evolution of Carbon Dioxide in Living Organisms

INVESTIGATING EVOLUTION OF HEAT

Using Thermo Flasks with Germinating and Boiled Seeds

METHOD: Two Thermo Flasks are Set Up, One with Germinating Seeds, Another with Boiled Seeds Thermometer Wrapped in Cotton Wool (Prevents Heat from Escaping) are Added Initial Temperature is Recorded Seeds are Left for a Few Days Final Temperature is Recorded

RESULT: As the Germinating Seeds are Alive, They will be Respiring Aerobically, Producing Energy in the Form of Heat, Causing the Temperature of Thermo Flask to Rise as a Result As the Boiled Seeds have Died, They will Not be Respiring Aerobically, Therefore No Energy is Produced, Causing the Temperature to Remain the Same