Transport of water and mineral salts
Xylem and phloem <ul><li>Xylem  brings  water  and dissolved  mineral salts  to the leaf from the soil via the roots </li>...
Transport of Water and Minerals in Plants <ul><li>Most plants secure the water and minerals they need from their roots.  <...
 
 
Entry of water and mineral salts into the leaf <ul><li>Veins in the leaf form fine branches which end among the mesophyll ...
Fate of glucose in Leaves Photosynthesis Glucose Starch (storage)  e.g. in  potatoes Cellulose cell walls Sucrose (storage...
Mineral Nutrition <ul><li>Plants use simple inorganic substances to manufacture complex organic compounds  </li></ul><ul><...
Mineral nutrition <ul><li>Trace elements </li></ul><ul><li>Essential elements </li></ul>Types of elements Trace elements :...
Summary
Photosynthesis
Adaptations of the leaf to photosynthesis Refer to pg.114 textbook click me! click me! click me ! click me! click me! clic...
Absorption spectrum
Lesson Objectives <ul><li>Absorption and action spectrum </li></ul><ul><li>Tests for factors involved in photosynthesis </...
Lesson Objectives <ul><li>Why do some plants have coloured leaves? Does that mean that they don’t have chlorophyll? </li><...
Why are plants green? <ul><li>Presence of chlorophyll in chloroplast makes  plants green </li></ul>Why do we perceive plan...
Visible light is a part of a larger spectrum of radiation called the electromagnetic spectrum  Electromagnetic spectrum
We perceive the colours of objects because… The wavelengths of light is either  absorbed  or  reflected We see only the re...
Why are some leaves permanently red or yellow ? <ul><li>There are a  number of different pigments  in plants.  </li></ul><...
Why do plants change colour in autumn? <ul><li>In leaves, the carotenoids are usually  masked by the chlorophyll </li></ul...
Variegated leaves <ul><li>Chlorophyll is present only in different areas of the leaves </li></ul>
Absorption and action spectrum Action spectrum   is an  indicator of which wavelength of light can be used by a plant to a...
Absorption and action spectrum
Limiting factors Definition: Any factor that directly affects a process if its quantity is changed 1. Concentration of CO ...
Limiting factors Effects of various factors on the rate of photosynthesis
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Chapter 7 Nutrition in Plants Lesson 2 - Transport of water and mineral salts_Action and absorption spectrum

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Chapter 7 Nutrition in Plants Lesson 2 - Transport of water and mineral salts_Action and absorption spectrum

  1. 1. Transport of water and mineral salts
  2. 2. Xylem and phloem <ul><li>Xylem brings water and dissolved mineral salts to the leaf from the soil via the roots </li></ul><ul><li>Phloem transport manufactured sugars from green cells to all the plant cells </li></ul>Back
  3. 3. Transport of Water and Minerals in Plants <ul><li>Most plants secure the water and minerals they need from their roots. </li></ul><ul><li>The path taken is: soil -> roots -> stems -> leaves </li></ul><ul><li>The minerals (e.g. K + , Ca 2+ ) travel dissolved in the water (often accompanied by various organic molecules supplied by root cells) </li></ul>
  4. 6. Entry of water and mineral salts into the leaf <ul><li>Veins in the leaf form fine branches which end among the mesophyll cells </li></ul><ul><li>Veins contain xylem and phloem </li></ul><ul><li>Water and mineral salts diffuse out of xylem then further diffuse from cell to cell through the mesophyll of the leaf </li></ul><ul><li>Once essential raw materials are received, photosynthesis occurs </li></ul><ul><li>Manufactured food are transported via the phloem to all plant cells </li></ul>
  5. 7. Fate of glucose in Leaves Photosynthesis Glucose Starch (storage) e.g. in potatoes Cellulose cell walls Sucrose (storage) - in fruit Lignin - structural material in wood <ul><li>Lipids and oils </li></ul><ul><li>for storage </li></ul><ul><li>for synthesis of new protoplasm </li></ul><ul><li>used in cellular respiration </li></ul>Amino acids and proteins e.g enzymes Refer to pg. 125 Bio textbook
  6. 8. Mineral Nutrition <ul><li>Plants use simple inorganic substances to manufacture complex organic compounds </li></ul><ul><li>Conversion of glucose into more complex compounds require elements </li></ul><ul><li>e.g. i) nitrogen -> for growth </li></ul><ul><li> ii) magnesium -> is part of the chlorophyll in all green plants and essential for photosynthesis </li></ul><ul><li>which plants obtain from mineral salts </li></ul>
  7. 9. Mineral nutrition <ul><li>Trace elements </li></ul><ul><li>Essential elements </li></ul>Types of elements Trace elements : needed in small amounts; mostly obtained from soil Essential elements : necessary for healthy plant growth e.g. boron, iodine e.g. carbon, hydrogen, oxygen, nitrogen, phosphorus, sulphur
  8. 10. Summary
  9. 11. Photosynthesis
  10. 12. Adaptations of the leaf to photosynthesis Refer to pg.114 textbook click me! click me! click me ! click me! click me! click me! Any broad and flattened region of a plant or alga, which allows for increased photosynthetic surface area
  11. 13. Absorption spectrum
  12. 14. Lesson Objectives <ul><li>Absorption and action spectrum </li></ul><ul><li>Tests for factors involved in photosynthesis </li></ul><ul><li>Test for starch in leaves </li></ul><ul><li>To test if sunlight is necessary for photosynthesis </li></ul><ul><li>To test if carbon dioxide is necessary for photosynthesis </li></ul><ul><li>To test if chlorophyll is necessary for photosynthesis </li></ul><ul><li>To test for the gas given out during photosynthesis </li></ul><ul><li>To investigate the effect of different light intensities on the rate of photosynthesis </li></ul><ul><li>To investigate the effect of different temperatures on the rate of photosynthesis </li></ul>
  13. 15. Lesson Objectives <ul><li>Why do some plants have coloured leaves? Does that mean that they don’t have chlorophyll? </li></ul><ul><li>Why some plants change colour during the seasons </li></ul><ul><li>Absorption and action spectrum </li></ul><ul><li>Limiting factors </li></ul><ul><li>Experiments to test the factors in photosynthesis </li></ul>
  14. 16. Why are plants green? <ul><li>Presence of chlorophyll in chloroplast makes plants green </li></ul>Why do we perceive plants as green?
  15. 17. Visible light is a part of a larger spectrum of radiation called the electromagnetic spectrum Electromagnetic spectrum
  16. 18. We perceive the colours of objects because… The wavelengths of light is either absorbed or reflected We see only the reflected wavelengths of light
  17. 19. Why are some leaves permanently red or yellow ? <ul><li>There are a number of different pigments in plants. </li></ul><ul><li>Chlorophyll </li></ul><ul><li>most prevalent photosynthetic pigment </li></ul><ul><li>2. Carotenoids </li></ul><ul><li>any leaves that contain them in predominance appear yellow , orange or red . </li></ul><ul><li>Examples: </li></ul><ul><li>beta-carotene - orange colour </li></ul><ul><li>lutein - yellow colour </li></ul>
  18. 20. Why do plants change colour in autumn? <ul><li>In leaves, the carotenoids are usually masked by the chlorophyll </li></ul><ul><li>In the autumn, as the quantity of chlorophyll in the leaf declines , the carotenoids become visible and produce the yellows and reds of autumn foliage </li></ul>
  19. 21. Variegated leaves <ul><li>Chlorophyll is present only in different areas of the leaves </li></ul>
  20. 22. Absorption and action spectrum Action spectrum is an indicator of which wavelength of light can be used by a plant to allow photosynthesis Absorption spectrum is the spectrum used to measure absorption of the various wavelengths of light Pg.121 textbook
  21. 23. Absorption and action spectrum
  22. 24. Limiting factors Definition: Any factor that directly affects a process if its quantity is changed 1. Concentration of CO 2 2. Light intensity 3. Temperature Rate of photosynthesis is affected by external factors such as: sunlight chlorophyll Carbon dioxide + water -> glucose + oxygen + water vapour
  23. 25. Limiting factors Effects of various factors on the rate of photosynthesis

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