Some plants store starch as grains. Some starch grains have rings on the surface and the grains from different plant types differ in size and shape. You are required to: • observe and draw starch grains from two different types of plant • compare the starch grains from these two different types of plant. You are provided with starch grains, in water, from two different types of plant, labelled F and G. 1. Put one clean and dry microscope slide on a piece of black card with a paper towel underneath as shown in Fig. 2.1. black card starch grains in suspension slide paper towel [Figure 2.1] 2. Using a pipette put a few drops of F containing starch grains onto the slide. 3. Cover the starch grains with a coverslip and use a paper towel to remove any excess liquid that is outside the coverslip. 4. View the slide to observe the starch grains using the microscope. Select an area of starch grains on the slide. You may need to reduce the amount of light entering the microscope to observe the grains clearly. You must adjust the fine focus to observe the starch grains. 5. Select three starch grains which show the different sizes and features of the grains. 6. Make a large drawing in (a)(i) of the three starch grains that you have selected. 7. Remove the slide from the microscope and place on a paper towel. 8. Repeat step 1 to step 7 with G.
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