Photosynthesis

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Photosynthesis

  1. 1. Photosynthesis
  2. 2. Objective 1 <ul><li>To trace the primary food source in a food chain to the green plant </li></ul>
  3. 3. The Primary Food Source <ul><li>Green plants always found at the beginning of the food chain. </li></ul><ul><li>Why? </li></ul><ul><li>The only organisms that can produce their own food </li></ul><ul><li>They are called producers </li></ul>
  4. 4. Objective 2 <ul><li>To define photosynthesis </li></ul>
  5. 5. PHOTOSYNTHESIS <ul><li>Photo = light </li></ul><ul><li>Synthesis = building up </li></ul>
  6. 6. DEFINITION <ul><li>Photosynthesis </li></ul><ul><li>Process by which plants use water & carbon dioxide to make carbohydrates in the presence of light and chlorophyll . </li></ul><ul><li>Oxygen is given off during the process. </li></ul>
  7. 7. Objective 3 <ul><li>To understand the conditions necessary for plants to make their own food </li></ul>
  8. 8. INTRODUCTION Yummy!!! What are the similarities between baking a cake and photosynthesis?
  9. 9. REQUIREMENTS <ul><li>Raw materials </li></ul><ul><ul><li>Carbon dioxide </li></ul></ul><ul><ul><li>Water </li></ul></ul><ul><li>Conditions </li></ul><ul><ul><li>Chlorophyll </li></ul></ul><ul><ul><li>Light energy </li></ul></ul>
  10. 10. Answers <ul><li>Review 1 </li></ul><ul><ul><li>An organism that make its own food, e.g. green plant </li></ul></ul><ul><ul><li>They make their own food by photosynthesis </li></ul></ul><ul><li>Review 2 </li></ul><ul><ul><li>Textbook pg 19 </li></ul></ul><ul><li>Review 3 </li></ul><ul><ul><li>Raw materials: water & carbon dioxide </li></ul></ul><ul><ul><li>Conditions: sunlight & chlorophyll </li></ul></ul><ul><ul><li>End products: oxygen & glucose </li></ul></ul>
  11. 11. Objective 4 <ul><li>To outline the process of photosynthesis by which plants manufacture carbohydrates using raw materials </li></ul><ul><li>To state that food is stored as starch in the plant </li></ul>
  12. 12. CARBON DIOXIDE <ul><li>From air </li></ul><ul><li>Enters leaf by diffusion </li></ul><ul><li>Pores: Stomata/Stoma </li></ul><ul><li>Found underside of the leaf </li></ul>
  13. 13. Carbon dioxide
  14. 14. WATER <ul><li>From soil </li></ul><ul><li>Absorb by root hair </li></ul><ul><li>Enter by osmosis </li></ul><ul><li>Transport by xylem vessel </li></ul>
  15. 15. Soil Water Water Root Hair To Xylem Vessel Water Water
  16. 16. CHLOROPHYLL <ul><li>Structure: Chloroplast </li></ul><ul><li>Green pigment: Chlorophyll </li></ul><ul><li>Absorb light energy </li></ul>
  17. 17. Leaf Plant Cell Chloroplast
  18. 18. LIGHT ENERGY <ul><li>Chlorophyll absorbs light energy from sun </li></ul><ul><li>Light energy converted into chemical energy </li></ul><ul><li>Chemical energy is needed to convert carbon dioxide to carbohydrate </li></ul><ul><li>Series of chemical reactions </li></ul>
  19. 19. Xylem H 2 O CO 2 H 2 O H 2 O CO 2
  20. 20. Carbon Dioxide +Water Light Chlorophyll Glucose + Oxygen O 2 O 2 Surroundings STARCH
  21. 21. WORD EQUATION <ul><li>CARBON DIOXIDE + WATER </li></ul><ul><li> GLUCOSE + OXYGEN </li></ul>LIGHT ENERGY CHLOROPHYLL
  22. 22. Review 4 <ul><li>Water, carbon dioxide, sunlight </li></ul><ul><li>Chlorophyll </li></ul><ul><li>It absorb the sunlight/light energy </li></ul><ul><li>Chloroplasts </li></ul><ul><li>The root hair absorb the water by osmosis </li></ul><ul><li>Xylem vessel </li></ul><ul><li>It enters through the stomata by diffusion </li></ul><ul><li>Carbon dioxide + water glucose + oxygen </li></ul>Light energy Chlorophyll
  23. 23. Objective 5 <ul><li>To state the conditions that affect the rate of photosynthesis </li></ul>
  24. 24. LIMITING FACTORS <ul><li>Rate of photosynthesis is affected by: </li></ul><ul><ul><li>carbon dioxide, </li></ul></ul><ul><ul><li>light intensity and </li></ul></ul><ul><ul><li>temperature </li></ul></ul>
  25. 25. LIGHT INTENSITY <ul><li>Higher light intensity, faster the rate of photosynthesis </li></ul><ul><li>After awhile, the rate will remain constant </li></ul><ul><li>Due to limiting factors such carbon dioxide concentration or temperature </li></ul>
  26. 26. CARBON DIOXIDE <ul><li>Carbon dioxide in the air is 0.03% </li></ul><ul><li>Increasing the carbon dioxide concentration to 0.1% increases the rate of photosynthesis </li></ul><ul><li>After awhile the rate will remain constant due to limiting factor such as temperature and light intensity </li></ul>
  27. 27. TEMPERATURE <ul><li>Temperatures below 40°C, as it rises, the rate of photosynthesis is faster </li></ul><ul><li>At 40°C, photosynthesis begins to decrease </li></ul><ul><li>As temperature rises above 40°C, photosynthesis stop as the enzymes denatured </li></ul>
  28. 28. Other important things that plant need to grow <ul><li>Minerals </li></ul><ul><ul><li>Found in soil and fertilizers </li></ul></ul><ul><ul><li>Magnesium: chlorophyll formation </li></ul></ul><ul><ul><li>Nitrogen: for making proteins </li></ul></ul>
  29. 29. Objective 6 <ul><li>To compare the conditions for healthy growth of ornamental plants and large scale crop productions </li></ul>
  30. 30. Ornamental Plants <ul><li>Use for decoration </li></ul><ul><li>Usually grown in greenhouses </li></ul>
  31. 31. Ornamental Plants <ul><li>Conditions needed </li></ul><ul><ul><li>Types of soil – sand, organic matter </li></ul></ul><ul><ul><li>Minerals – artificial or natural fertilizers </li></ul></ul><ul><ul><li>Humidity - humid conditions better, by spraying and misting </li></ul></ul><ul><ul><li>Temperature - warm </li></ul></ul><ul><ul><li>Light - bright </li></ul></ul><ul><ul><li>Carbon dioxide – burning fuels </li></ul></ul><ul><ul><li>Water – watering plants </li></ul></ul><ul><ul><li>Pests – hand pick/pesticides </li></ul></ul>
  32. 32. Large scale crops <ul><li>Includes rice, wheat, vegetables </li></ul><ul><li>Relies on farming methods and agricultural technology </li></ul><ul><li>Plant in open field </li></ul>
  33. 33. Large scale crops <ul><li>Light, humidity, temperature and water – cannot be controlled </li></ul><ul><li>Fertilizers – mostly used artificial fertilizers, machines </li></ul><ul><li>Pests – planes to spray pesticides over farm areas </li></ul>
  34. 34. Experiment Question
  35. 35. Experiment: Testing for starch in green leaves <ul><li>What does hot water do to the leaf? </li></ul><ul><ul><li>Kills the leaf to stop photosynthesis </li></ul></ul><ul><li>What does the alcohol do to the leaf? </li></ul><ul><ul><li>Breaks down chlorophyll – take the green colour out of the leaf </li></ul></ul><ul><li>What is the original colour of iodine? </li></ul><ul><ul><li>brown </li></ul></ul><ul><li>What does it mean when iodine turn blue-black? </li></ul><ul><ul><li>Starch is present </li></ul></ul>

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