1 Second mid exam/ Biology/ Grade 8

Section A

Circle the correct letter of the correct answer

1.

2.

3.

4.

Grade:8B Name: 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.

2 Second mid exam/ Biology/ Grade 8

5.

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12.

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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

5 Second mid exam/ 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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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]

………………………………………………………………………………………………………

……………………………………………………………………………………………………….

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]

7 Second mid exam/ 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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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 be st