Visualizing Photosynthesis and Cellular Respiration Key

Visualizing Photosynthesis & Cellular Respiration Key Teacher: ________________________________ Date: ___________ Period: _________________ Photosynthesis Photosynthesis is one of the most important biological events that occur on this planet. It is defined as the process by which plants use solar energy to convert the raw materials carbon dioxide (CO2) and water (H2O) into glucose (C6H12O6) for use as an energy source. Oxygen gas is also produced as the byproduct that all aerobically-respiring organisms (such as humans) are dependent upon. The general chemical equation for photosynthesis is: 6 H2O + 6 CO2 + solar energy → C6H12O6 + O=C=O + SUN LIGHT → + 6 O2 + O=O Following photosynthesis, the glucose constructed within plant cells can then be used as a source of energy and materials for cellular activities such as growth, reproduction and the synthesis of more complex materials such as starch, cellulose, and proteins. The existence of all naturally-occurring organic molecules (any molecule containing carbon, hydrogen, and oxygen), and therefore, all sources of energy, can be traced back to the process of photosynthesis. Using colored pencils/crayons color the chemicals in both equations above. Be sure to use the following colors for each molecule(s): Water → Blue Carbon Dioxide → Red Glucose → Green Oxygen → Orange Sunlight (Energy)→ Yellow Visualizing Photosynthesis & Cellular Respiration Key Teacher: ________________________________ Date: ___________ Period: _________________ Respiration Energy is defined as the ability to do work. The cells of all organisms, and therefore, all organisms, require a continuous supply of energy for the performance of their daily, vital activities. Carbohydrates, especially glucose, generally provide this energy through the process of cellular respiration. Simply stated, respiration is the release of energy from energy-storing compounds (ATP). It is represented by the chemical equation: C6H12O6 + 6 O2 → 6 CO2 + 6 H2O + energy (heat, light, ATP) + O=O → O=C=O + + ATP (ENERGY) Notice that the process of cellular respiration is essentially the reverse of photosynthesis. The catabolic breakdown of glucose requires the presence of oxygen and yields energy and carbon dioxide. This process is generally the same when any organic molecule is respired (or burned) whether it is glucose in a living animal or plant cell, wood in a fire, or gasoline in a car. The breakdown of any energy storing chemical releases carbon dioxide as a byproduct, which may then be used by plants for the photosynthetic process. Using colored pencils/crayons color the chemicals in both equations above. Be sure to use the following colors for each molecule(s): Water → Blue Carbon Dioxide → Red Glucose → Green Oxygen → Orange ATP (Energy)→ Yellow Visualizing Photosynthesis & Cellular Respiration Key Teacher: ________________________________ Date: ___________ Period: _________________ Questions: 1. Glucose is what type of sugar --- monosaccharide, disaccharide, or polysaccharide? monosaccharide 2. How does a plant obtain carbon for photosynthesis, and how does it enter the plant? Plants get the carbon they use in photosynthesis from carbon dioxide which enters the plant via the stomata. 3. In what plant organelle does photosynthesis occur? Chloroplast 4. The oxygen released by plants comes from the (light independent/light dependent) reactions in photosynthesis. 5. What is the main product of cellular respiration? ATP 6. The energy for photosynthesis comes from the ___sun___. 7. Name the process that breaks down sugars to release energy to do cellular work. Cellular respiration 8. What energy molecule is used by cells to do work? ATP 9. What waste gas is given off during cellular respiration, and how does this help plants? Carbon dioxide is given off which plays an important role in photosynthesis. 10. Where does cellular (aerobic) respiration occur in plants and animals (organelle name)? Mitochondria Bonus Question: What do cells use the energy from ATP for? For all the cell’s activities or to power all the reactions taking place in the cell i.e. transport, protein synthesis, cell division, cell movement, etc. (all acceptable)