2016年11月IB生物SL真题下载-Paper3
1. In an experiment measuring oxygen consumption, a laboratory mouse was placed in a respirometer for a short time. Soda lime solution absorbed any carbon dioxide produced during the experiment.
(a) Suggest the purpose of the wire mesh.
(b) Describe how the apparatus measures the oxygen consumption of the mouse.
(c) Discuss whether the apparatus would be suitable for measuring the oxygen consumption of a small green plant during respiration.
2. The enzyme amylase was extracted from the digestive system of horses and added to whole cereal grains (seeds) in test tubes at 39 °C to determine which grain was digested quickest. Each test tube received equal quantities of the enzyme. The quantity of starch remaining in the grains after 15 minutes was measured.
(a) Suggest one reason for differences between the cereal grains, in the percentage of starch remaining after 15 minutes.
(b) Suggest one method that could have been used to keep the tubes at a constant temperature.
(c) Explain the importance of having equal quantities of the enzyme at the start of the experiment.
3. The micrograph shows a section of an organ in the human body.
(a) State from which organ the section was taken.
(b) Identify the layer of tissue found at X.
(c) The actual length of the structure labelled Y is 0.8 mm between the two black lines.
Calculate the magnification of the micrograph. Working should be shown.
2016年11月IB生物SL真题余下省略！
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