Photosynthesis Experiments PDF

 LEARNING OBJECTIVES To explain the necessity for chlorophyll, light , carbon dioxide and light intensity for photosynthesis, using appropriate controls.  Starter Write the word equation for photosynthesis.  Video links Light...

 LEARNING OBJECTIVES To explain the necessity for chlorophyll, light , carbon dioxide and light intensity for photosynthesis, using appropriate controls.  Starter Write the word equation for photosynthesis.  Video links Light : https://www.youtube.com/watch?v=Qr0ARIjqYmk Co2 https://www.youtube.com/watch?v=R1YXMRdPOXw Test leaf for starch https://www.youtube.com/watch?v=0s_xZqvwm_s Test for Starch  MUST TASK 1. Why was the leaf put into boiling water? 2. Why did the alcohol become green? 3. Why was the plant de starched before the beginning of the experiment?  Must task answers 1. A leaf is dropped in boiling water to kill and break down the cell walls. 2. The leaf is left for 5-10 minutes in hot ethanol in a boiling tube. This removes the chlorophyll so alcohol appears green in colour. 3. It is necessary to destarch a plant before performing photosynthesis experiment because the amount of starch formed during the experiment should be validated. Investigating the effect of varying light intensity on the rate of photosynthesis. Investigating the effect of varying light intensity on the rate of photosynthesis.  During photosynthesis, light energy is converted into __________ energy stored in glucose. The main factor tested in an experiment investigating the rate of photosynthesis is __________. The chemical used to test for the presence of starch in a leaf is __________.  MiniPlenary During photosynthesis, light energy is converted into __________ energy stored in glucose. The main factor tested in an experiment investigating the rate of photosynthesis is __________. The chemical used to test for the presence of starch in a leaf is __________. (Chemical, light intensity, iodine solution)  Group tasks Group 1 1. What happens to a leaf when it is boiled in water and alcohol during the starch test? 2. 2. List out the materials required to prove that "Carbon dioxide is essential for Photosynthesis". Group 2 1. A potted plant with one of its leaves is partially covered with aluminum foil. The plant is placed under sunlight for several hours. The leaf is then removed, boiled in water, treated with alcohol, and tested with iodine solution. What conclusion can be drawn if only the uncovered part turns blue-black Group 3: How can you relate the light intensity experiment to the concept of limiting factors in photosynthesis?  Answers Group 1.Boiling the leaf in water softens it and kills the cells. Boiling it in alcohol removes the chlorophyll, making the leaf pale or white, so the iodine solution can clearly show any color change. 2.Two potted plants.Soda lime (to absorb CO₂),Water, Vaseline or sealing material (to make airtight setups)Iodine solution Group 2.The uncovered part of the leaf turns blue-black because it received light, which is essential for photosynthesis. The covered part does not turn blue-black, indicating that photosynthesis did not occur there due to the absence of light. Group 3- the rate of photosynthesis increases as the light intensity increases (evidenced by more bubbles of oxygen being produced). However, after a certain point, the rate of photosynthesis stops increasing even if the light intensity continues to rise.  PLENARY https://jeopardylabs.com/play/photosynthesis-1915  HOME LEARNING 1. Why do some plants have red leaves. How do they trap sunlight ?