Digestion and Marks

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Biology revision test ch.6 2 mid-term exam Marks: /110 1. The following diagram shows two similar models simulating a region of the mammalian alimentary canal.
The water in the test tubes surrounding the dialysis tubings was tested with standard food test reagents at the beginning of the experiment and again after one hour. The results showed that neither starch nor reducing sugar was present in the water surrounding tubes A and B at the beginning of the experiment. (7 marks)

water bath at 37ºC
starch + water
starch + amylase + water
dialysis tubing
test tubes
A
B
water bath at 37ºC
starch + water
starch + amylase + water
dialysis tubing
test tubes
A
B

(a)What results would be expected after one hour when water surrounding the dialysis tubing was tested for starch and reducing sugar?(2 marks) -------------------------------------------------

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(b)Name a suitable chemical for testing reducing sugar.(1 mark) -------------------------------------------------

(c)What structure in the human body does the liquid surrounding the dialysis tubing represent?(1 mark) -------------------------------------------------

(d)If the experiment were repeated, with the two test tubes placed in a refrigerator instead of a water bath, how would you expect the results to differ? Explain your answer.(3 marks) -------------------------------------------------

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2. The figure below shows a human teeth set in the lower jaw. (9 marks)
P
Q
R
S
T
P
Q
R
S
T

(a)What type of tooth is P? How many roots does it have? (2 marks) -------------------------------------------------

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(b)Is this teeth set normally found in a 4-year-old boy or a 40-year-old man? What is the evidence which supports your hypothesis? (2 marks) -------------------------------------------------

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(c)List two differences between milk teeth and permanent teeth. (2 marks) -------------------------------------------------

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(d)Write down the letter of the teeth which is responsible for tearing food. (1 mark) -------------------------------------------------

(e)State the special feature of tooth T and state the corresponding function of such feature. (2 marks) -------------------------------------------------

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3. The diagram below shows the human digestive system labelled A to J. (15 marks) F
A
B
G
H
C
D
E
I
J
F
A
B
G
H
C
D
E
I
J

(a)Which structures of the digestive system secrete juice that provides an alkaline condition? Use the letters to indicate the parts. (2 marks) -------------------------------------------------

(b)In which structure can amylase, protease and lipase first be found along the alimentary canal? Use the letters to indicate the structures. (3 marks) -------------------------------------------------

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(c)(i) What is structure A? (1 mark)
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(ii)Structure A contains a fluid. What is this fluid called? Name two substances found in this fluid.(3 marks) -------------------------------------------------

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(d)Name any two structures in the diagram that have functions other than digestion or absorption. State their functions. (4 marks) -------------------------------------------------

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