 Lesson Objectives: 1. Explain the link between respiration and photosynthesis [B/A] 2. Explain the effect of limiting factors on the rate of photosynthesis [A/A*] Starter Make sure your photosynthesis sheet is completed from last lesson THEN – why do farmers worry if they have a dull, dry summer??? Sunday, December 06, 2015 Factors affecting photosynthesis

 Any factor that slows down the rate of photosynthesis if there is not enough  Eg  Temperature  Amount of carbon dioxide  Amount of water  Light

 What does this demo show? How could you prove it?

1. Draw a diagram of the equipment 2. What was happening to the elodea in the light? 3. What was happening to the elodea in the dark? 4. What is the limiting factor here? 5. How could you prove what gas is being produced? 6. How could you use this method to calculate the rate of photosynthesis

 What is the link between respiration and photosynthesis?  At night: Plants ONLY respire – there is no light for them to photosynthesise with  During the day: Plants photosynthesise AND respire. The oxygen they produce during photosynthesis is used for respiration

You should now be able to 1. Explain the link between respiration and photosynthesis [B/A] 2. Explain the effect of limiting factors on the rate of photosynthesis [A/A*]

 Plants grow faster on warm sunny days  Light is required for photosynthesis  Oxygen is required for photosynthesis  Photosynthesis speeds up in the cold  Plants produce glucose by photosynthesis  Glucose is converted to starch for storage  Plants only carry out respiration in the dark  Plants carry out respiration for 24 hours a day  Plants can use the carbon dioxide from respiration for photosynthesis  Plants can use the oxygen from respiration for photosynthesis