Nutrition in Plants Chapter 7
<ul><li>Give the word equation of photosynthesis </li></ul>Recall: <ul><li>Give the chemical equation of photosynthesis </...
Importance of photosynthesis <ul><li>During photosynthesis, carbohydrates formed can be converted to fats, protein and oth...
Lesson Objectives: <ul><li>To name the various parts of a plant </li></ul><ul><li>Structure of the leaf </li></ul><ul><li>...
What is a plant? <ul><li>Like you, plants:  </li></ul><ul><li>are made of cells.  </li></ul><ul><li>need food to get energ...
 
 
 
Venation branch veins mid-rib vein network
Label the parts of a leaf
Refer to page 129 textbook (no chloroplasts) (no chloroplasts)
Leaf Structure
Label the cells in the leaf upper epidermis lower epidermis stoma palisade mesophyll spongy mesophyll Intracellular spaces...
 
Main site of photosynthesis <ul><li>The  mesophyll  which lies below the upper epidermis is the main site of photosynthesi...
Stomata <ul><li>Minute openings bounded by 2  guard cells </li></ul>guards cells stoma
Guard cells <ul><li>Bean-shaped </li></ul><ul><li>Contain chloroplasts </li></ul><ul><li>Only epidermal cells that can mak...
Structure of stomata
Action of guard cells <ul><li>The water potential in the guard cells is lowered by </li></ul><ul><li>i) sugars produced du...
 
Gaseous exchange in the leaf of a plant
<ul><li>The exchange of  oxygen  and  carbon dioxide  in the leaf (as well as the loss of  water vapour ) occurs through p...
Entry of carbon dioxide In daylight, photosynthesis occurs Carbon dioxide rapidly used up Carbon dioxide concentration in ...
Activity: <ul><li>Predict why oxygen diffuses out of the leaf and into the atmosphere. </li></ul>
How do we distinguish between the xylem and phloem?
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Chapter 7 Nutrition in Plants Lesson 1 - Structure of plants and leaves, Gaseous exchange in plants

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Chapter 7 Nutrition in Plants Lesson 1 - Structure of plants and leaves, Gaseous exchange in plants

  1. 1. Nutrition in Plants Chapter 7
  2. 2. <ul><li>Give the word equation of photosynthesis </li></ul>Recall: <ul><li>Give the chemical equation of photosynthesis </li></ul>Carbon dioxide + water glucose + oxygen + water 6CO 2 + 12H 2 O C 6 H 12 O 6 + 6O 2 + 6H 2 O chlorophyll sunlight chlorophyll sunlight
  3. 3. Importance of photosynthesis <ul><li>During photosynthesis, carbohydrates formed can be converted to fats, protein and other organic compounds  food for animals </li></ul><ul><li>Allows animals who feed on plants to obtain energy as photosynthesis converts energy from the sun to chemical energy </li></ul><ul><li>Fossil fuels are a store of energy derived from sunlight through photosynthesis </li></ul><ul><li>Maintains O 2 and CO 2 balance in atmosphere </li></ul>
  4. 4. Lesson Objectives: <ul><li>To name the various parts of a plant </li></ul><ul><li>Structure of the leaf </li></ul><ul><li>Adaptations of the leaf to plant survival </li></ul>
  5. 5. What is a plant? <ul><li>Like you, plants: </li></ul><ul><li>are made of cells. </li></ul><ul><li>need food to get energy and materials with which to grow </li></ul><ul><li>respond to the environment with many behaviors </li></ul><ul><li>Unlike you, plants: </li></ul><ul><li>can make their own high energy food from low energy molecules </li></ul><ul><li>can keep growing and can often replace missing body parts </li></ul><ul><li>do not have nerves or muscles, so they cannot think, feel or move </li></ul>
  6. 9. Venation branch veins mid-rib vein network
  7. 10. Label the parts of a leaf
  8. 11. Refer to page 129 textbook (no chloroplasts) (no chloroplasts)
  9. 12. Leaf Structure
  10. 13. Label the cells in the leaf upper epidermis lower epidermis stoma palisade mesophyll spongy mesophyll Intracellular spaces cuticle
  11. 15. Main site of photosynthesis <ul><li>The mesophyll which lies below the upper epidermis is the main site of photosynthesis </li></ul><ul><li>Consists of 2 regions: </li></ul><ul><ul><li>Palisade tissue </li></ul></ul><ul><ul><li>Spongy mesophyll </li></ul></ul>Cells contain numerous chloroplasts which enable them to absorb max. sunlight for photosynthesis
  12. 16. Stomata <ul><li>Minute openings bounded by 2 guard cells </li></ul>guards cells stoma
  13. 17. Guard cells <ul><li>Bean-shaped </li></ul><ul><li>Contain chloroplasts </li></ul><ul><li>Only epidermal cells that can make sugars </li></ul><ul><li>Regulates the loss of water and gaseous exchange in the leaves of a plant </li></ul>How?
  14. 18. Structure of stomata
  15. 19. Action of guard cells <ul><li>The water potential in the guard cells is lowered by </li></ul><ul><li>i) sugars produced during photosynthesis </li></ul><ul><li>ii) high K + ions (increased with sunlight exposure) </li></ul><ul><li>Water enters the guard cells by osmosis </li></ul><ul><li>Guard cells swell and become turgid </li></ul><ul><li>Because the guard cells have a thicker cellulose cell wall on one side of the cell (the side around the stomatal pore)  the swollen guard cells become more curved and pull the stoma open </li></ul>
  16. 21. Gaseous exchange in the leaf of a plant
  17. 22. <ul><li>The exchange of oxygen and carbon dioxide in the leaf (as well as the loss of water vapour ) occurs through pores called stomata (singular = stoma) </li></ul>Gaseous exchange in the leaf of a plant Back http:// web.ukonline.co.uk/webwise/spinneret/plants/leafst.htm
  18. 23. Entry of carbon dioxide In daylight, photosynthesis occurs Carbon dioxide rapidly used up Carbon dioxide concentration in leaf becomes lower than atmospheric air Diffusion gradient exists Carbon dioxide diffuses from the external environment through the stomata into the air spaces in the leaf Film of water on surface of mesophyll cells so that carbon dioxide can dissolve; dissolved carbon dioxide diffuses into the cells
  19. 24. Activity: <ul><li>Predict why oxygen diffuses out of the leaf and into the atmosphere. </li></ul>
  20. 25. How do we distinguish between the xylem and phloem?

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