Core Practical 16 Respirometer To Calculate Rq 7 8 Edexcel [d biology classroom] caie a level biology 9700how to make a simple respirometer and use it to determine the rq of an organism?to purchase exam practice ques. Learn this aqa a level required practical method for the investigation into the effect of a named variable on the rate of respiration of cultures of single c.
A Level Biology Respirometer Aqa Required Practical How To Measure You can find all my a level biology videos fully indexed at freesciencelessons.co.uk a level revision videos a level biology in this video, we lo. One type is shown in the diagram. using a respirometer to measure the rate of uptake of oxygen. the organisms to be investigated are placed in one tube, and non living material of the same mass in the other tube. soda lime is placed in each tube, to absorb all carbon dioxide. cotton wool prevents contact of the soda lime with the organisms. For each group of students: respirometer, 1 (note 1)this is comprised of: two boiling tubes, one basket or cage (metal or plastic), one 1 cm 3 syringe, two bungs (1 holed if using 3 way taps, 2 holed if these are not available), and one manometer (a capillary u tube fixed to a scale on a board and filled with coloured oil – note 2). From this data the respiratory quotient (rq) can be calculated. rq = volume of carbon dioxide given off. volume of oxygen taken in. the rq values of the following substrates are well documented from previous investigations: carbohydrate 1.0; protein 0.9; fat 0.7. it is interesting to know which substrate is being metabolised.
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