Comparing Photosynthesis and Respiration The most important chemical reaction in the world is… PHOTOSYNTHESIS The chemical reaction for photosynthesis is 6CO2 + 6H2O + energy C6H12O6 + 6O2

Comparing Photosynthesis and Respiration Sugar Carbon Dioxide 6CO2 + 6H2O + energy C6H12O6 + 6O2 Oxygen Water Sunlight

Comparing Photosynthesis and Respiration Stage 1 Chlorophyll in the Chloroplasts captures sunlight

Comparing Photosynthesis and Respiration Stage 2 The cell uses the captured sunlight, carbon dioxide and water to make food

Comparing Photosynthesis and Respiration Stage 2 Carbon Dioxide enters the plant through Stomata -small openings on the underside of the leaf

THE PHOTOSYNTHESIS - RESPIRATION CYCLE COMPARING PHOTOSYNTHESIS AND RESPIRATION THE PHOTOSYNTHESIS - RESPIRATION CYCLE PHOTOSYNTHESIS RESPIRATION Plants Produce Sugar Oxygen Organisms Use Carbon Dioxide Water Energy Plants use Organisms Produce

Comparing Photosynthesis and Respiration The process by which cells obtain energy from glucose RESPIRATION The chemical reaction for respiration is C6H12O6 + 6O2 6CO2 + 6H2O + energy

Comparing Photosynthesis and Respiration Oxygen Carbon Dioxide C6H12O6 + 6O2 6CO2 + 6H2O + energy Water Sugar

Comparing Photosynthesis and Respiration Stage 1 Takes place in the cytoplasm Molecules of glucose are broken down into smaller molecules Oxygen is NOT involved Small amount of energy is released

Comparing Photosynthesis and Respiration Stage 2 Takes place in the Mitochondria Small molecules are broken down into even smaller molecules Oxygen is required A great deal of energy is released Carbon dioxide and water are also produced

THE PHOTOSYNTHESIS - RESPIRATION CYCLE COMPARING PHOTOSYNTHESIS AND RESPIRATION THE PHOTOSYNTHESIS - RESPIRATION CYCLE PHOTOSYNTHESIS RESPIRATION Sugar Oxygen Plants Produce Sugar Oxygen Organisms Use Carbon Dioxide Water Energy Organisms Produce Plants use Carbon Dioxide Water Energy

THE PHOTOSYNTHESIS - RESPIRATION CYCLE COMPARING PHOTOSYNTHESIS AND RESPIRATION THE PHOTOSYNTHESIS - RESPIRATION CYCLE PHOTOSYNTHESIS Plants Produce Sugar Oxygen Carbon Dioxide Water Energy Plants use

Comparing Photosynthesis and Respiration Testing Photosynthetic Rate of Elodea Elodea – a common water plant Elodea releases bubbles of oxygen as it photosynthesizes Freshly cut Elodea stems produce more bubbles than the leaves

Comparing Photosynthesis and Respiration Testing Photosynthetic Rate of Elodea Materials Elodea Plants Scissors Large Container Clear test tube Water Sunlight

Comparing Photosynthesis and Respiration Testing Photosynthetic Rate of Elodea Procedures Fill the large container half full of water Cut the stem of the Elodea plant at an angle (for greater surface area)

Comparing Photosynthesis and Respiration Testing Photosynthetic Rate of Elodea Procedures Insert the plant, cut stem first, into the test tube Fill the test tube to overflowing with water

Comparing Photosynthesis and Respiration Testing Photosynthetic Rate of Elodea Procedures Cover the top of the test tube with your thumb Invert the test tube over the beaker and put the test tube with your thumb still covering the opening into the beaker

Comparing Photosynthesis and Respiration Testing Photosynthetic Rate of Elodea Procedures Release your thumb and gently settle the test tube on the bottom of the container Place the beaker and test tube in sunlight or under a bright lamp

Comparing Photosynthesis and Respiration Testing Photosynthetic Rate of Elodea Procedures At 5 minute intervals for a total of 15 minutes, record the number of bubbles produced Make a graph of your findings Have someone in your group report out to the class

THE PHOTOSYNTHESIS - RESPIRATION CYCLE COMPARING PHOTOSYNTHESIS AND RESPIRATION THE PHOTOSYNTHESIS - RESPIRATION CYCLE RESPIRATION Sugar Oxygen Organisms Use Organisms Produce Carbon Dioxide Water Energy

Comparing Photosynthesis and Respiration Respiration and Carbon Dioxide Bromthymol Blue (BTB) An acid-base indicator that can be used to measure levels of carbon dioxide (CO2) BTB changes color from blue to green and then yellow as it gets more acidic

Comparing Photosynthesis and Respiration Respiration and Carbon Dioxide Bromthymol Blue (BTB) If carbon dioxide is added to the solution it will become more acidic and change color moving to green and then yellow If carbon dioxide is removed from the solution it will become more basic and change color moving to blue

Comparing Photosynthesis and Respiration Respiration and Carbon Dioxide This experiment uses Bromthymol Blue to examine the relationship between exercise and the amount of carbon dioxide you produce

Comparing Photosynthesis and Respiration Respiration and Carbon Dioxide Materials 2 straws 2 plastic cups Timer Bromthymol Blue solution Paper towels

Comparing Photosynthesis and Respiration Respiration and Carbon Dioxide Procedure Label one cup “1” and the other cup “2” Fill both cups to the marked line with BTB

Comparing Photosynthesis and Respiration Respiration and Carbon Dioxide Procedure Record the color in both cups on your lab sheet Place a straw in cup 1

Comparing Photosynthesis and Respiration Respiration and Carbon Dioxide Procedure Have a group member blow through the straw into the solution until it changes color Have a group member time how long it takes for the solution to change color

Comparing Photosynthesis and Respiration Respiration and Carbon Dioxide Procedure Record how long it took for the solution to change color on your lab sheet Remember the solution is changing color because you are exhaling carbon dioxide into it

Comparing Photosynthesis and Respiration Respiration and Carbon Dioxide Procedure Predict how long it would take the solution to change color after exercise Record your prediction on your lab sheet

Comparing Photosynthesis and Respiration Respiration and Carbon Dioxide Procedure Design an experiment to test your prediction This means a group member must do some form of exercise (like jumping jacks)

Comparing Photosynthesis and Respiration Respiration and Carbon Dioxide Procedure The exercise should be something you can do “in place” near your tables Only one group member will perform the exercise

Comparing Photosynthesis and Respiration Respiration and Carbon Dioxide Procedure Write down the steps of your experiment Get your teacher’s approval BEFORE you begin your experiment

Comparing Photosynthesis and Respiration Respiration and Carbon Dioxide Procedure Follow the directions in the Analyze and Conclude section of your lab sheet to conduct your experiment and record your results