Download Quiz 3

South Tuen Mun Government Secondary School
Biology Quiz 3
(A) Choose the best answer. (15 marks)
Directions : Questions 1 and 2 refer to the diagram below which shows a vertical section of a human tooth in
the jaw:
1. Which structures contain a large amount of calcium salts?
A. 1, 2 and 3 only
B. 1, 3 and 4 only
C. 1, 3 and 5 only
D. 2, 4 and 5 only
2. Which of the following structures has a rich supply of nerve endings?
A. 1
B. 3
C. 4
D. 5
3. In an operation, a large part of the colon of a person was removed. As a result, the person could not
A. take in solid food.
B. produce sufficient digestive enzymes.
C. absorb amino acids efficiently.
D. produce solid faeces.
4. When bile is added to a sample of oil containing a few drops of universal indicator solution, the colour of
the indicator change indicates an increase in pH. The pH increases because
A. bile contains bile pigment.
B. bile is alkaline.
C. bile emulsifies the oil.
D. bile breaks down oil into fatty acids.
5. Food tests were carried out on a certain kind of drink. The results are as follows:
Result of the test
DCPIP test
Biuret test
Benedict’s test
Colourless solution
Blue solution
Blue solution
What can be concluded from the results?
A. The drink contains protein.
C. The drink contains protein and reducing sugar.
B. The drink contains vitamin C.
D. The drink contains vitamin C and reducing sugar.
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Directions : Questions 6 and 7 refer to the table below which shows the composition of food substances in four
vegetables:
* Carotene can be converted to vitamin A in the human body.
6. Vivian, a 6-year-old girl, does not have meat or milk in her diet. Which of the vegetables listed in the table
is most important for her growth?
A. potato
B. soya bean
C. spinach
D. green pepper
7. If Vivian has bleeding gums, which vegetable is most effective in helping her to recover?
A. potato
B. soya bean
C. spinach
D. green pepper
8. The table below shows the results of an experiment to compare the amount of vitamin C in four fruit juices
P, Q, R, S:
Fruit juice
Number of drops used to decolourise 1 cm3 DCPIP
P
Q
R
S
20
24
40
28
Which fruit juice has the highest vitamin C concentration?
A. P
B. Q
C. R
D. S
9. Vegetarians mainly eat plant products. Compared to a diet with meat, a vegetarian diet of the same mass
contains
(i) less fat
(ii) more protein
(iii) more dietary fibre
A. (i) and (ii) only
B. (i) and (iii) only
C. (ii) and (iii) only
D. (i), (ii) and (iii)
10. Which of the following is not an essential component of the human diet?
A. nitrates
B. fat
C. calcium salts.
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D. water
Directions : Questions 11 to 13 refer to the diagram below which shows a section through a villus:
11. Which of the following are the functions of structure P?
(i) it transports fat away.
(ii) it transports glucose and amino acids away.
(iii) it transports oxygen to the cells.
A. (i) and (ii) only
B. (i) and (iii) only
C. (ii) and (iii) only
D. (i), (ii) and (iii)
12. Which of the following substances are transported by structure Q?
(i) fat soluble vitamins
(ii) fat
(iii) minerals
A. (i) and (ii) only
B. (i) and (iii) only
C. (ii) and (iii) only
D. (i), (ii) and (iii)
13. What are the characteristics of the villus for absorption of food?
(i) Villus is one cell thick to reduce the distance for diffusion.
(ii) Villus is rich in blood supply that increases the concentration gradient for faster diffusion.
(iii) Villus is highly folded to increase the surface area of diffusion.
A. (i) and (ii) only
B. (i) and (iii) only
C. (ii) and (iii) only
14. In Hong Kong, many school children are overweight because they
(i) eat a lot of vegetables
(ii) take in more energy than they spend,
(iii) do little sport.
A. (i) and (ii) only
B. (i) and (iii) only
C. (ii) and (iii) only
D. (i), (ii) and (iii)
D. (i), (ii) and (iii)
15. The stomach wall produces mucus to cover its surface. Which of the following correctly describe(s) the
function of the mucus?
(i) It kills bacteria in the ingested food.
(ii) It prevents the rubbing of food against the stomach wall.
(iii) It protects the stomach wall from the action of the digestive enzymes.
A. (i) and (iii) only
B. (ii) only
C. (i) and (ii) only
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D. (ii) and (iii) only
(B) Answer the following questions. (35 marks)
1.
The diagram below shows the human alimentary canal.
(a) Name structures B and C.
(2 marks)
(b) (i) Name the secretion that passes down from C to D.
(1 mark)
(ii) Explain how the secretion in (i) that helps the digestion of protein.
(4 marks)
(c) An obese (very fat) person had a surgical operation to remove part of structure D. Explain why this
method may lead to a significant reduction of the body weight after several months.
(3 marks)
(d) Cellulose is a plant material that cannot be broken down by the human alimentary canal. Describe
how cellulose forms an essential component of a balanced diet.
(3 marks)
2.
In order to lose weight, an 18-year-old girl, Jane, had a diet as shown in the table below:
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(a) If the average daily energy requirement for Jane is about 9200 kJ, explain why this diet will be
effective in helping her to lose weight.
(3 marks)
(b) Protein in the diet can be absorbed into the body as amino acids. Explain how amino acids can provide
energy for Jane’s daily activity.
(3 marks)
(c) If Jane continues this diet for several months, what disease will she probably develop as a result of
mineral deficiency?
(1 mark)
(d) Describe a food test to show that fat is present in ham.
(3 marks)
(e) (i) Name the major kind of carbohydrate in the bread.
(ii) Describe how this kind of carbohydrate is digested and absorbed in man.
(6 marks)
3.
The following diagram shows an experimental set-up that is used to study an enzyme taken out from saliva.
The petri dish is filled with starch agar and 4 paper discs, A, B, C, D are put into the positions as shown
below:
Before putting into the petri dish, the paper discs, A, B, C, and D are soaked into different solutions as
described in the table below:
Paper disc
Solution
A
1 cm3 of enzyme solution + 1 cm3 sodium hydrogen carbonate solution + 3 cm3
distilled water
B
1 cm3 of enzyme solution + 1 cm3 hydrochloric acid + 3 cm3 distilled water
C
1 cm3 of enzyme solution + 4 cm3 distilled water
D
1 cm3 of boiled enzyme solution + 4 cm3 distilled water
(a) At the end of the experiment, iodine solution is added into the petri dish, describe the function of the
iodine solution.
(2 marks)
(b) Around which disc(s), A, B, C, D, will a clear zone develop? Explain why a clear zone is formed.
(2 marks)
(c) Explain why no clear zone is observed in B and D.
(2 marks)
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South Tuen Mun Government Secondary School
Biology Quiz 3
Marking Scheme
(A) Choose the best answer. (15 marks)
1. C
2. C
3. D
4. B
6. B
7. D
8. A
9. B
11. C
12. A
13. D
14. C
5. B
10. A
15. D
(B) Answer the following questions. (35 marks)
*spelling must be correct
1. (a) B – *liver (1)
C – *pancreas
(b) (i) *pancreatic juice (1)
(ii) Pancreatic juice contains protease (1) that catalyses the breakdown of protein into smaller peptide (1).
Pancreatic juice contains alkaline salt / sodium hydrogen carbonate (1) that provides an optimum pH
8 – 9 for protease (1).
(c) When part of structure D is removed, the rate of digestion and / or absorption is reduced. (1) Energy
intake is less than the energy expenditure of the body (1). The body will use the fat / food reserve inside
the body for the release of energy (1).
(d) Cellulose adds bulk to the food (1) and helps peristalsis (1), thus it can prevent constipation / it can make
the passage of food / the discharge of faeces out of the body easier (1).
2. (a) The daily energy intake of Jane is 6620 kJ (1) which is less than her daily energy requirement (1). Then
she has to use the fat / food reserve in her body (1) leading to the loss of her body weight.
(b) Amino acids are broken down in the liver (1) to form carbohydrate (1) which will be oxidized / used in
respiration to release energy (1).
(c) anaemia (1)
(d) Rub the piece of ham on a filter paper (1), a translucent spot is seen after drying (1). Then put the filter
paper in an organic solvent (chloroform / ether / acetone) and the spot will disappear (1). OR Add the
ham to alcohol to obtain a clear solution (1), add water to the clear solution (1). The solution will turn
milky (1).
(e) (i) *starch (1)
(ii) In the mouth (½), salivary amylase catalyses the breakdown of starch into maltose (1). In the small
intestine (½), pancreatic amylase catalyses the breakdown of starch into maltose (1). In the small
intestine, carbohydrase catalyses the breakdown of maltose into glucose (1). Glucose moves from the
small intestine into the blood by diffusion (1) and active transport (1).
3. (a) Iodine solution is used to test for the presence of starch (1). When starch is found, iodine solution changes
from brown to blue black (1).
(b) C (1), the enzyme in the saliva is amylase that catalyses the breakdown of starch into maltose (1).
(c) In B, the enzyme is denatured at low pH, starch cannot be broken down (1). In D, the enzyme is
denatured by boiling, starch cannot be broken down (1).
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