A food technologist is checking whether a low-fat salad dressing mixes oil effectively with water. Fig. 1 shows two test tubes after standing for five minut...
Question 1 Report
A food technologist is checking whether a low-fat salad dressing mixes oil effectively with water. Fig. 1 shows two test tubes after standing for five minutes. Tube A contains oil and water only. Tube B also contains a small amount of bile salt solution. Table 1 shows the mean diameter of oil droplets seen using a microscope.
Table 1
| tube | mean oil droplet diameter / mm |
|---|---|
| A | 2.4 |
| B | 0.3 |
(a) Describe the difference between the oil droplets in tubes A and B. [2]
(b) Name the substance in the human digestive system that has the same role as the bile salt solution. [1]
(c) Explain how making fat droplets smaller helps fat digestion. [2]
(d) State the organ that produces bile. [1]
(e) Complete the sentence: bile is stored in the ________ before it is released into the small intestine. [2]
Answer Details
(a) Oil droplets in tube B are smaller. Their mean diameter is \(0.3\) mm rather than \(2.4\) mm in tube A, so B has more small droplets. [2]
(b) The equivalent digestive substance is bile. [1]
(c) Smaller fat droplets have a larger total surface area. This gives lipase more surface on which to act, so fat is digested more rapidly. [2]
(d) Bile is produced by the liver. [1]
(e) Bile is stored in the gall bladder before release into the small intestine. [2]
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