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8.2. Human digestive system
A subsection of Biology, 5090, through 8. Human nutrition
Listing 10 of 93 questions
shows the arrangement of teeth in the lower jaw of an adult person. C B Identify the types of teeth labelled B and C and state one function of each. type B function type C function During a single day two people ate the same amount of food containing a large amount of carbohydrate. Person D ate the food in three equal portions at 7.00 am, 1.00 pm and 8.00 pm, following which he brushed his teeth using toothpaste before going to bed. Person E ate the food in smaller portions more frequently during the day and did not brush her teeth before going to bed. List the chemical elements that make up carbohydrates. If persons D and E continue their eating habits for several years, suggest in which person dental decay will occur first. Explain your reasoning. person explanation
5090_s12_qp_21
THEORY
2012
Paper 2, Variant 1
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shows four types of human teeth A, B, C and D. A B C D below shows the arrangement of teeth in the lower jaw of a human. Complete to show the following for each of the two types of teeth indicated: • the identity of each type of tooth by writing the correct letter A, B, C or D from • the name of each type of tooth • one function of each type of tooth. letter from name of type of tooth one function letter from name of type of tooth one function State the causes of dental decay. Describe the proper care of teeth.
5090_w17_qp_21
THEORY
2017
Paper 2, Variant 1
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The diagram shows a section through a molar tooth of a human. pulp made of living tissue containing sensory nerve endings and blood capillaries dentine enamel State the function of a molar tooth. The pulp is a living tissue. Describe the movement of molecules in the pulp between the blood capillaries and the cytoplasm of the surrounding cells. Toothache is caused by inflammation of the pulp tissue and is often a sign of dental decay. Describe the cause of dental decay and how it can be prevented.
5090_s22_qp_21
THEORY
2022
Paper 2, Variant 1
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shows a decaying tooth. K area of decay Name the type of tooth shown. Name two structures that are found in region K. Explain the causes of the decay shown in . Two different regions were studied to see the effect of fluoridation of drinking water on the mean number of decayed teeth in children living in those regions. In region L, the percentage of children drinking fluoridated water gradually increased over a 30-year period. In region M, no fluoride was added to the drinking water over the same period. Table 5.1 shows the mean number of decayed teeth per child in each region. It also shows the percentage of children drinking fluoridated water in region L. Table 5.1 date region L region M percentage mean number mean number 3.9 2.1 3.3 1.9 2.7 1.8 1.2 1.6 State the effect of adding fluoride to the water supplies in region L. Suggest three possible reasons for the results shown for children in region M.
5090_w14_qp_21
THEORY
2014
Paper 2, Variant 1
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The health of a population’s teeth can be measured by finding the average number of decayed, missing or filled teeth per person. This is called the DMFT. The graph shows the DMFT for four countries in the years between 1980 and 1995. Australia and the USA have fluoride added to their water but Japan and Belgium do not. year DMFT key Japan Australia USA Belgium The following statements were made. The health of teeth has improved in all four countries. Japan showed the greatest improvement. Adding fluoride to the water causes the health of teeth to improve. Which statements are supported by the graph?
5090_w15_qp_11
MCQ
2015
Paper 1, Variant 1
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Questions Discovered
93