2017年11月IB生物SL真题下载-Paper3
1. To investigate the thermal properties of water, students placed hot water in two thin plastic cups and measured their rate of cooling. The sides of one cup were covered with tissue paper soaked in hot water; the other cup was left uncovered. The temperature was recorded with a thermometer every 4 minutes for 20 minutes. The temperature in the laboratory was 18 °C.
(a) Calculate the change in temperature in each cup after 20 minutes.
(b) State two conditions that must be the same for each cup at the start of the experiment.
(c) Predict the temperature of the water in the cups after 3 hours.
(d) Explain, with reference to the thermal properties of water, how this experiment helps demonstrate how humans respond to overheating.
2. Thin-layer chromatography was carried out on red and brown algae to discover what photosynthetic pigments they contained. The results were compared with the known pigments found in spinach leaves.
(a) Identify pigment labelled P.
(b) State a suitable solvent for extracting photosynthetic pigments from plant tissue.
(c) Explain how the pigments in the chromatogram of spinach are identifi ed.
3. The micrograph shows a transverse section through blood vessels of a mammal.
(a) Identify the vein by labelling it with the letter V. [1]
(b) Distinguish between the vein and the artery with reference to structures visible in the micrograph.
2017年11月IB生物SL真题余下省略!
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