This document appears to be a biology exam for 8th grade students covering topics related to digestion. It contains 20 multiple choice questions testing knowledge of enzymes, parts of the digestive system, and nutrients. It also includes 4 essay questions requiring students to label a diagram of the digestive system, describe the role of specific vitamins, explain adaptations of villi, and describe a test for protein in eggs. The exam is divided into sections for multiple choice, labeling diagrams, short answers, and explanations. It provides context and tests various learning objectives related to the digestive system and nutrients.

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Secondmidexam/Biology/Grade 8
Section A
Circle the correct letter of the correct answer
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Grade:8BName: Index:
GA.Atoll School
G.A. Kolamaafushi
Subject : Biology Mid term test, Term 2-2012 Date : 07-08-2012
Total Marks :50 Time :50 minutes.

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Secondmidexam/Biology/Grade 8
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Secondmidexam/Biology/Grade 8
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Secondmidexam/Biology/Grade 8
13. What are the substrate and end product for the action of the enzyme lipase?
Substrate end products
A. Fat amino acids
B. Fat Fatty acids
C. Protein amino acids
D. Protein fatty acids
14.In the human body, where is bile produced?
A. Gall bladder B. Liver C. Pancreas D. Stomach
15. Which substance consist of small, soluble molecules and does not have to be digested
before it can pass through the wall of the alimentary canal?
A. Fat B. Glucose C. Protein D. Starch
16. Which food contains the highest concentrations of protein and iron?
A. Bread B. Citrus fruits C. Fresh vegetables D. Meat
17. Which one of the following is an enzyme secreted bythe pancreas?
A. Pepsin B. Lipase C. Maltase D. Sodium hydrogen carbonate
18. Where do chemical digestion and absorption of food occur in the human alimentary canal?
Chemical digestion absorption
A. Esophagus colon
B. Oesophagus Stomach
C. Stomach Liver
D. Stomach Ileum

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Secondmidexam/Biology/Grade 8
19. Which region of the alimentary canal has the greatest surface area for absorption of food
molecules?
A. Colon B. Duodenum C. Ileum D. Stomach
20.Which secretion, released into the alimentary canal, contains no enzymes but speeds up fat
digestion?
A. Bile B. Intestinal juice C. Mucus D. Pancreatic juice
Section B
Answer all the questions
1. Fig.1 shows the human alimentary canal.
a) Using the appropriate letter, label on Fig. 1 where each of the following is produced.
[4 marks]
An amylase (A) Hydrochloric acid (B) a lipase (C) a protease (D)
b) State the nutrient on which protease enzyme act and name the products that are formed.
[2 marks]
Nutrient:___________________________________________
Products:__________________________________________

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Secondmidexam/Biology/Grade 8
c) Name the part of the alimentary canal where: [2 marks]
Bile is produced:
Absorption takes place:
d) Fig.2 shows a section through the gut and how food is moved along it.
X
Y
i) Above the longitudinal section draw a large arrow to indicate the direction in which the
food is moving. [1 mark]
ii) Identify the tissues X and Y. [2 marks]
X ………………………………………………………….
Y………………………………………………………….
iii) Name and describe the process which causes the food to move along the gut.
[2 marks]
………………………………………………………………………………………………………
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e) If the region of the gut shown is the esophagus, name the enzyme present in the ball of
the food. [1 mark]
……………………………………………………………………………………………………….
f) Why will the enzyme stop functioning after it leaves the esophagus? [1 mark]
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[Total: 15 marks]

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Secondmidexam/Biology/Grade 8
2. Some of the fruits are the important part of a healthy diet.
a) Suggest one reason for eating food rich in fiber. [1 mark]
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b) Name the vitamin which is associated with citrus fruits and green vegetables. State the
function of this vitamin in the body. [2 marks]
Vitamin:____________________________________________________
Function:___________________________________________________
c) State the deficiency disease of this vitamin. [1 mark]
………………………………………………………………………………………………………
d) Which vitamin is needed for healthy growth of bones and teeth? [1 mark]
………………………………………………………………………………………………………
[Total: 5 marks]
3. The fig. 3 shows a section through a villus.
a) Write the number of the parts that describes their functions below. [4 marks]
Absorbs glucose ………………..
Absorbs digested fats ………………..
Produces mucus ………………..
Produces enzymes ………………..

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Secondmidexam/Biology/Grade 8
b) Suggest two adaptations of villi that help to carry out its process. [2 mark]
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[Total: 6 marks]
4. Explain how you would carry out the test whether an egg contains protein.
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[Total: 4 marks]
All the best