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1. Obtain some bromothymol blue from your teacher. BTB is a chemical that shows if carbon dioxide is present. 2. Using a straw, gently blow bubbles into the solution until it completely changes color.  A. What was the initial color of BTB? o Blue  B. What was the color of the solution after we blew bubbles into it? o Greenish - yellow  C. What color does BTB change to when carbon dioxide is present? o Greenish Yellow  D. What do you think would happen to the color of the solution if the carbon dioxide were used up? o It would go back to blue

 a. Would the presence of plants in water cause the carbon dioxide to increase, decrease, or stay the same? Explain your answer. o They would cause the carbon dioxide to decrease because of photosynthesis (carbon dioxide is used up)  b. When would you expect photosynthesis to happen, in the day or at night? Explain your answer. o More in the day because of the light of the sun

 Your teacher will set up an experiment using BTB (yellow) and Elodea Plant. Picture to your right shows the experimental set up.  We will wait about 50 minutes to record our data  a. Why did you need to make sure the BTB solution had completely changed color before starting the experiment? o We need to compare the results to the initial color.  b. Write a Hypothesis about what you think will happen to the color of the BTB solution in each of the four containers. (ITB format)

 Your teacher will set up another experiment using plant seed and BTB (blue)  We will check our results in about 45 minutes.  Write a prediction about what you think will happen to the color of the solution in each container.

 The process by which a cell captures energy from the sun and uses it to make food (glucose)

THE SUN

Raw Materials = Carbon dioxide + Water Products = Sugar (glucose) + Oxygen Equation: 6 CO H 2 O +  C 6 H 12 O O 2 Carbon water sugar oxygen Carbon water sugar oxygen dioxide (glucose) dioxide (glucose) Raw MaterialsProducts SUN

Chloroplast

 Respiration is the process by which cells obtain energy from sugar (glucose).  During respiration, cells break down simple food molecules like sugar and release the energy they contain. EAT RESPIRATION

 Plant cells make more energy from the sun than they need  They store it as sugars and starches  Animals store energy as fats and sugars

Raw Materials = Sugar (glucose) + Oxygen Products = Carbon dioxide + Water Equation: C 6 H 12 O O 2  6 CO H 2 O + C 6 H 12 O O 2  6 CO H 2 O + sugar oxygen Carbon water sugar oxygen Carbon water (glucose) dioxide (glucose) dioxide Raw MaterialsProducts ENERG Y

Mitochondria

 Respiration and photosynthesis go hand in hand.  What is made during photosynthesis is used during respiration and the products of respiration are used as raw materials for photosynthesis.

 “Photo” = light energy  “Synthesis” = putting things together.  Occurs in chloroplasts (plants!)  carbon dioxide + water + light = oxygen + glucose

 Occurs in mitochondria (all organisms, plants and animals)  Glucose + oxygen = water + carbon dioxide + energy

ContainerInitial ColorFinal Color #1 Plant with lightYellowGreen #2 Plant with no lightYellow #3 no plant with lightYellow #4 no plant-no lightYellow ContainerInitial ColorFinal Color #1 with seedsBlue #2 No seedsBlue Photosynthesis Experiment - A Cellular Respiration Experiment - B

1. Experiment A: In which container(s) did photosynthesis occur? Use your data and knowledge of photosynthesis to explain your answer. 2. Did the results from Experiment A support your hypothesis? 3. Experiment B: In which container did cellular respiration occur? Use your data and knowledge of cellular respiration to explain your answer. 4. Did the results from Experiment B support your hypothesis? 5. Why was light a variable in Experiment A but not a variable in Experiment B? 6. Summarize what you learned during this investigation. (At least 3 sentences)