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YEAR 8 BIOLOGY EXAM TERM 1

1. State the meaning of the following terms.

a. Digestion [2]

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b. Absorption [1]

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3. Diffusion [2]

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

2. State the uses of the following parts of the alimentary canal.[5]

1. Mouth

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2. Small intestine

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3. Large intestine

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4. Liver

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5. oesophagus

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3. State one use of the following substances in the alimentary canal [4]

1. Hydrochloric acid

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2. Pancreatic juice

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3. Bile juice

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4. Amylase

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4. Arrange the following organs according to how they follow one another from the mouth to the anus. [6]

Anus, small intestine, duodenum, large intestines, stomach, esophagus, appendix, Mouth

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5. State any 4 types of teeth and in each state its use. [8]

1

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2

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3

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4

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6. State two things you can do to take care of your teeth. [2]

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7. What is a balanced diet [1]

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8. Name any 6 things that must be present in a balanced diet. [6]

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9. State the deficiency disease of lacking the following [4]

a. Vitamin C

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b. Vitamin D

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c. Iron

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d. Calcium

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10. Lee Chan Song did an experiment to investigate the effect of boiling amylase enzyme. Amylase breaks down starch to form sugar molecules.

She carried the experiment by taking two test-tubes. She labelled them A and B. She put in each test-tube 10ml of amylase and 5ml of starch.

She then boiled the mixture in A and did not heat B.

She waited for the mixture to cool to room temperature. She then tested the two solutions for starch and for sugar.

She found out that starch was present in A and not in B, while sugar was present in B and not in A.

1. Name two variables that Lee kept constant [2]

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2. Name one variable that she changed. [1]

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3. Describe how she carried out the test for:-

1. Starch using iodine [4]

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2. Sugar using Benedict solution. [5]

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4. She concluded that boiling destroys enzyme amylase. Explain how she reached to that conclusion. [4]

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11. Draw and label the external structure of a leaf. [4]

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