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How do environmental factors affect the rate of photosynthesis?

Explore the effects of light intensity and CO2 concentration on the rate of photosynthesis. Investigate the internal factors of plants that affect photosynthesis.

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How do environmental factors affect the rate of photosynthesis?

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  1. How do environmental factors affect the rate of photosynthesis? 1 Light intensity The effect of light intensity on the rate of photosynthesis.

  2. Investigation of the effect of light intensity on the rate of photosynthesis Procedure: rubber tubing clip 1 Set up the apparatus as shown. Keep the temperature constant. Turn on the lamp at a distance of 0.1m and allow the pond weed to equilibrate for 5 minutes. dilute sodium hydrogencarbonate solution pipette thermometer Hydrilla water bench lamp

  3. Investigation of the effect of light intensity on the rate of photosynthesis Procedure: rubber tubing clip 2 Suck up the solution from the boiling tube. Close the clip completely and record the starting position of the meniscus in the pipette. dilute sodium hydrogencarbonate solution pipette thermometer Hydrilla water bench lamp

  4. Investigation of the effect of light intensity on the rate of photosynthesis Procedure: rubber tubing clip 3 After 5 minutes, record the final position of the meniscus in the pipette. Calculate the rate of photosynthesis. Record two more readings. dilute sodium hydrogencarbonate solution pipette thermometer Hydrilla water bench lamp

  5. Investigation of the effect of light intensity on the rate of photosynthesis Procedure: rubber tubing clip 4 Repeat steps 1 to 3 with the bench lamp placed at a distance of 0.2m, 03m, 0.4m and 0.5m from the apparatus. dilute sodium hydrogencarbonate solution pipette thermometer Hydrilla water bench lamp

  6. How do environmental factors affect the rate of photosynthesis? 1 Light intensity rate of photosynthesis light intensity 1) Initially, the rate of photosynthesis increases rapidly with increasing light intensity as more energy is supplied to the light reactions.

  7. How do environmental factors affect the rate of photosynthesis? 1 Light intensity rate of photosynthesis saturation point (飽和點) light intensity 2) The increase stops when the light intensity reaches a saturation point.

  8. How do environmental factors affect the rate of photosynthesis? 1 Light intensity rate limited by other factors rate of photosynthesis saturation point (飽和點) light intensity 3) The rate is now limited by others factors, e.g. CO2 concentration and temperature.

  9. How do environmental factors affect the rate of photosynthesis? 2 CO2 concentration The effect of carbon dioxide on the rate of photosynthesis.

  10. How do internal factors of plant affect the rate of photosynthesis? 1)mid-ribbranches into a network of veins two layers of tissues: palisade mesophyll& spongy mesophyll

  11. How do internal factors of plant affect the rate of photosynthesis? 2)Palisade mesophyll made up of tightly packed cylinder-shaped cells contain many chloroplasts

  12. How do internal factors of plant affect the rate of photosynthesis? 3)Spongy mesophyll  cells not regular in shape  fewer chloroplasts  many air spaces

  13. How do internal factors of plant affect the rate of photosynthesis? 4)Epidermis  cover both surfaces  protects cells against mechanical injuries and infection

  14. How do internal factors of plant affect the rate of photosynthesis? 4) Epidermal cells haveno chloroplasts, except guard cells

  15. How do internal factors of plant affect the rate of photosynthesis? 5)Cuticle  cover the epidermis  reduces loss of water

  16. How do internal factors of plant affect the rate of photosynthesis? 6)Stoma  surrounded by guard cells which control the opening and closing of the stoma  guard cells have manychloroplasts stoma guard cell

  17. How do internal factors of plant affect the rate of photosynthesis? 6) There are far fewerstomata on the upper surface of a leaf to reduce water loss. stoma guard cell

  18. How do internal factors of plant affect the rate of photosynthesis? 7)Vascular bundles  for transport solutions containing chemical which plants need.  contains xylem and phloem

  19. How do internal factors of plant affect the rate of photosynthesis? Xylem  transports water and minerals from the roots to the leaves Phloem  transports nutrients from the leaves

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