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Answer each question and check where every mark went.
- 1
Question 1
A student investigated the effect of the concentration of pectinase on the volume of juice released from chopped apple. Pectinase breaks down the walls of apple cells, so more juice can be collected. The student put 20 g of chopped apple into each of five beakers, added 10 cm³ of pectinase of a different concentration to each, kept every beaker at 35 °C for 20 minutes, then filtered each mixture and measured the volume of juice collected.
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10 marksOpen › - 2
Question 2
A student investigated the effect of temperature on the rate of respiration in yeast by counting the gas bubbles released in three minutes at each temperature. The table shows the results.
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10 marksOpen › - 3
Question 3
A scientist observed a leaf under a hand lens and made the biological drawing shown in Fig. 3.1. On the drawing, the straight line PQ runs along the full length of the leaf. The drawing has a magnification of ×1.5.
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10 marksOpen › - 4
Question 4
A student tested a food sample and then planned a further investigation.
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10 marksOpen ›