1 / 16

Energetic Metabolism

Energetic Metabolism. Observing the Effects of Respiration and Photosynthesis. Interconnections: Photosynthesis & Respiration. Measure O 2 use. Measure O 2 production. Chemical Equations. Aerobic Respiration C 6 H 12 O 6 + 6O 2  6CO 2 + 6H 2 O + energy

zudora
Download Presentation

Energetic Metabolism

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Energetic Metabolism Observing the Effects of Respiration and Photosynthesis

  2. Interconnections:Photosynthesis & Respiration

  3. Measure O2 use Measure O2 production Chemical Equations • Aerobic RespirationC6H12O6 + 6O2  6CO2 + 6H2O + energy • Photosynthesis6CO2 + 6H2O + light energy  C6H12O6 + 6O2

  4. Metabolic Rate • Speed of aerobic respiration in an organism (use of O2) • Measured in Calories • unit of energy • amount of heat required to increase temperature of 1 kg of H2O by 1oC • 1 liter of O2 consumption = 4.825 Calories • Our experiment measures metabolic rate asmL O2/gram/day, which can be converted to calories

  5. Factors Affecting Metabolic Rate • Body Temperature Mealworms are ectothermic animals Hypotheses: Do plants or animals have a higher metabolic rate?How do environmental temperatures influence metabolic rates?

  6. Pipettes for mealworms: 5-mL at both 15 and 30oC mealworms peas cheesecloth soda lime Experimental Set Up Pipettes for peas: 1-mL at 15oC 5-mL at 30oC

  7. Reading the Respirometer Pipettes For 1-mL pipette 0.1 mL between numbers 0.01 mL between smallest lines For 5-mL pipette 1 mL between numbers 0.1 mL between smallest lines 1 mL 0.1 mL

  8. 2 3.5 mL30 min x 60 min 1 hour x 24 hours 1 day 1 Calculations • Suppose the total amount of O2 consumed in 30 minutesby 15.6 grams of mealworms was 3.5 mL. • Calculation of mL O2/gram/day 3.5 mL30 min x 60 min 1 hour x 24 hours 1 day x _____1______weight in grams x 1 = 15.6 grams = 10.8 ml O2/gram/day

  9. Graphing: Histogram Plot the class averages for pea and mealworm metabolic rates at both temperatures.

  10. More Calculations (see page 62) 150 x 453.6 =68040 grams 2.1 mLgram day x 4.825 calories 1000 mL x 68040 grams • Suppose the metabolic rate of your peas was 2.1 mL O2/ gram/day • Calculation of the calorie intake of a 150 pound student whose metabolic rate matches the peas 2.1 mLgram day x 4.825 calories 1000 mL x 68040 grams = 689.4 calories/day

  11. Photosynthesis Experiment HypothesisWill the rate of photosynthesis be increased by increased light energy?

  12. Syringe 1-mL pipette Elodea bicarbonatesolution Experimental Set Up For 1-mL pipette 0.1 mL between numbers 0.01 mL between smallest lines

  13. Graphing Photosynthesis Data Plot the oxygen produced for light at 50 cm and 25 cm for each timed reading.

  14. Graphing Photosynthesis Data Use separate lines to connect the sets of points.

  15. CLEAN UP! • Return your mealworms, peas, and elodea to the appropriate containers • Put used soda lime in discard bottle • Clean and dry your respirometers. • Discard cheesecloth into the trash • Make sure the sinks stay clean

  16. Worksheet • Complete pages 59-62 from lab manual • Be sure your instructor checks your completed worksheet before you leave the lab

More Related