Human Nutrition & Transport in Plants

Question 1

A student investigated the effect of different digestive enzymes on three food substances. She prepared three test tubes, each containing a different substrate, and added the enzyme shown in Table 1.1. After 30 minutes at 37 °C she tested each tube for the presence of the original substrate.

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Question 2

Fig. 2.1 shows a diagram of a villus from the lining of the ileum.

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Question 3

A student measured the rate of transpiration of a plant using a potometer under four different sets of conditions. Table 3.1 shows the conditions and the rate of movement of the air bubble in the potometer (in mm per minute), which is used as an estimate of transpiration rate.

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Question 4

Fig. 4.1 shows a transverse section through the stem of a flowering plant. Two regions, X and Y, are visible within the vascular bundle.

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