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Law of Limiting Factors in Photosynthesis: Understanding the Rate and Factors that Limit the Process

This article explains the concept of the law of limiting factors in photosynthesis, highlighting the factors that can restrict the rate of the process. It also discusses the experimental results and the relationship between light intensity, carbon dioxide availability, water, and chlorophyll. Additionally, it explores the MRS.GREN acronym and its relevance to plant respiration and nutrition.

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Law of Limiting Factors in Photosynthesis: Understanding the Rate and Factors that Limit the Process

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  1. If a car factory can make… 58 doors per week 16 engines per week 40 seats per week 33 windscreens per week … how many finished cars can it make in a week?

  2. The Law of Limiting Factors When a process depends on two or more factors, the rate of that process is limited by the factor which is in shortest supply The rate of photosynthesis in a plant can be limited by: • Light intensity • Availability of water • Availability of carbon dioxide • Availability of chlorophyll • Temperature

  3. Photosynthesis and the Law of Limiting Factors • What you need to know: • What factors limit the rate of photosynthesis? • How do we explain why certain factors limit the rate of photosynthesis? • Can we use the law of limiting factors to explain experimental results?  • Question: • What does MRS GREN stand for?

  4. What do the letters below stand for? Remember: as living things plants are respiring all the time M - movement R - respiration S - sensitivity G - growth R - reproduction E - excretion For plants Nutrition = Photosynthesis N - nutrition

  5. How does the rate of bubbles produced vary as light intensity is increased? No. of Bubbles per minute No. of Bubbles per minute No. of Bubbles per minute No. of Bubbles per minute Light Intensity Light Intensity Light Intensity Light Intensity

  6. Increasing light intensity has no effect as rate of photosynthesis is limited availability of carbon dioxide, water or chlorophyll Compensation point Rate of photosynthesis equals rate of respiration No. of Bubbles per minute Increasing light intensity increases rate of bubbling (and photosynthesis) Light Intensity Any oxygen produced by photosynthesis is used up in respiration

  7. Complete the questions on the Law of Limiting Factors and Photosynthesis worksheet

  8. Question 2: Question 1: a. 2 units of glucose can be made by plant A b. Light is in shortest supply (6 units of light are needed to make one unit of glucose) c. D (B is limited by the availability of CO2) d. 4 (it will be limited by the availability of water) Number of Bubbles per Minute Light Intensity Increasing light intensity increases the rate of photosynthesis Increasing light intensity has little to no effect. This is because the rate of photosynthesis is now limited by the availability of CO2/water/temperature

  9. The graph below shows how the amount of CO2 in the atmosphere in the Northern Hemisphere changes through the year Amount of Carbon Dioxide in the Atmosphere (arbitrary units) Describe the changes seen in the graph Suggest a reason for the changes seen in the graph

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