Biology-B4-Photosynthesis (RP) 0.0 / 5 ? BiologyPhotosynthesis and transpirationGCSEAQA Created by: tonisha_Created on: 25-04-22 19:38 Firstly get a what? boiling tube 1 of 26 And a ? ruler 2 of 26 And place the boiling tube how far away? 10cm 3 of 26 Away from what? the LED light source 4 of 26 Why use an LED light source? as it doesnt release much heat 5 of 26 Then fill the boiling tube with what? sodium hydrogen carbonate solution 6 of 26 What does this solution release? carbon dioxide 7 of 26 Then place the______in the tube? pondweed 8 of 26 With a what? cut end at the top 9 of 26 And leave it for how long? to do what? 2-5 mins to acclimatise 10 of 26 We will then see what being produced? bubbles 11 of 26 What are these bubbles? oxygen 12 of 26 Then start a? stopwatch 13 of 26 And count? the number of bubbles produced in one minute 14 of 26 Then repeat this? 2 more times 15 of 26 At what distance? 10cm 16 of 26 And calculate mean? number of bubbles produced in one minute 17 of 26 The do the whole? experiment again 18 of 26 But at distances of? 20cm 30cm 40cm 19 of 26 DISADVANTAGES ------------------- the number of bubbles can be too what? fast to count accurately 20 of 26 the bubbles are also not always what? the same size 21 of 26 How can we solve this? by calculating the volume of oxygen produced instead 22 of 26 What extra equipment would be used? a measuring cylinder funnel 23 of 26 Or ?a a gas syringe 24 of 26 What is the equation for light intensity? 1 ---------- d squared (distance squared) 25 of 26 This equation shows that _______ and ________ ______ are _____ ______? distance and light intensity are inversely proportional 26 of 26
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