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Comparing Photosynthesis and Cellular Respiration -Biochemical Pathways for Energy Section 8-3.

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Presentation on theme: "Comparing Photosynthesis and Cellular Respiration -Biochemical Pathways for Energy Section 8-3."— Presentation transcript:

1 Comparing Photosynthesis and Cellular Respiration -Biochemical Pathways for Energy Section 8-3

2 Where does the energy needed to make ATP come from? 1.To make ATP, cells must constantly break down glucose. (Glucose = 650 kilocalories). 2.The highly-energized bonds in glucose must be handed over to ATP because ATP holds a much smaller, more manageable amount of energy for the cell to use. 3.This process of making ATP from glucose is called cellular respiration. Remember that our cells must have ATP to run cellular chemical reactions.

3 Where does the Glucose come from? The highly-energized bonds in glucose are formed in a process called photosynthesis, which stores solar energy from the sun in those chemical bonds.

4 Comparing Cellular Respiration and Photosynthesis In photosynthesis, energy is stored in the bonds of glucose (C 6 H 12 O 6 ).  In cellular respiration, energy is released from glucose and stored in ATP molecules for the cell to use. Photosynthesis and cellular respiration are life’s most important processes.  Reason: energy!

5 Molecule Key CO 2 Carbon Dioxide O 2 Oxygen H 2 O Water C 6 H 12 O 6 Glucose ATP/ADPEnergy carrier

6 Energy released for Cellular Reactions* *Some lost as heat C 6 H 12 O 6 and 6O 2 6CO 2 and 6H 2 O Photosynthesis 36 ATP Breaks bonds in C 6 H 12 O 6 to transfer and store chemical energy in ATP 36 ADP & 36 P Cellular Respiration Solar Energ y Reactants Products Reactants Products Transforms solar energy into chemical energy by creating energy-storing bonds found in C 6 H 12 O 6

7 1.Solar energy is constantly required for this energy cycle to continue supporting life. 2.Carbon, oxygen, and hydrogen atoms are recycled in the environment in order to transfer chemical bond energy. Notes over Comparison Diagram

8 Go to Section: Photosynthesis Photosynthesis and cellular respiration form a cycle-the products of one are used as the reactants for the other. Cellular Respiration Happens In the Chloroplast! Happens In the Mitochondria!

9 Chlorophyll Go to Section: Photosynthesis Equation Photosynthesis produces glucose and oxygen, which are used as reactants in cellular respiration. Reactants 6 CO H 2 O —  C 6 H 12 O O 2 Light Energy Products Chloroplast

10 Cellular Respiration produces carbon dioxide and water, which are used as reactants in photosynthesis. (the process of obtaining energy) Cellular Respiration Equation C 6 H 12 O O 2 —  6 CO H 2 O + 36 ATP Reactants Products Enzymes Mitochondria

11 A Closer Look at Photosynthesis Photosythesis from leaf into granaPhotosythesis from leaf into grana animation Photosynthesis Overview Animation Photosynthesis AnimationsPhotosynthesis Animations tutorials

12 Why study photosynthesis Photosynthesis is the process producers use to transform solar energy into chemical energy (stored in food) (used or stored)

13 1.Light -- Light is a form of energy. 2.Chloroplasts – are green organelles in plants where photosynthesis occurs. 3.Pigments—colored molecules that help absorb light. 4.Chlorophyll -- green pigment found in chloroplasts that absorbs light energy. 5.Water – source of hydrogen atoms to make glucose. 6.Carbon Dioxide – source of carbon atoms to make glucose Requirements for Photosynthesis O H H C O O

14 Absorption of Light by Chlorophyll a and Chlorophyll b VBGYOR Chlorophyll b Chlorophyll a Go to Section: Chlorophyll Light Absorption 1.Chlorophyll BEST absorbs energy of red & blue light 2.Plants appear green because they REFLECT green light Plants grown in green light don’t grow very well. Why? Plants don’t absorb the energy in green light!

15 1.In each of the above beakers there is a submerged water plant under a funnel. As the light enters the cells of these plants photosynthesis occurs producing oxygen bubbles that can be seen coming out of the top of the funnel. Which beaker will produce the most oxygen bubbles? Which beaker will product the least oxygen bubbles? Light Intensity and Photosynthesis 1 3

16 As the intensity of light increases the rate of photosynthesis also increases. How does Light Intensity effect the rate of photosynthesis?

17 1. Plants obtain energy DIRECTLY from sun a.Plants will breakdown glucose for energy using cellular respiration b.Plants store extra glucose as starch to use later c.Plants use glucose to make cellulose for cell walls Go to Section: Benefits of Photosynthesis

18 2. Animals obtain energy INDIRECTLY from sun a.Animals can feed on plant’s stored glucose b.Animals get O 2 from plants Go to Section: Benefits of Photosynthesis

19 Comparison Chart Photosynthesis Cellular Respiration LocationChloroplastMitochondria Purpose Store solar energy into food Release energy in food to make ATP Reactants 6H 2 O & 6CO 2 C 6 H 12 O 6 & 6O 2 Reactants Water, carbon dioxide, & light energy Glucose (chemical energy) & oxygen Products C 6 H 12 O 6 & 6O 2 6H 2 O & 6CO 2 Products Glucose & oxygen Water, carbon dioxide, & 36 ATP (energy)

20 What about the animal cells? Mitochondria – power plant of the cell Glucose from food sources Oxygen in  fuel molecules (food) burned  ATP synthesized  CO 2 out


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