Answer all the questions.

1. (a) The table below shows three microorganisms.

[3 marks]

(b) The diagram below shows the levels of the cell organization in the human body. Write down cell, organ or system in the correct blanks shown in the diagram below.

[3 marks]

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2. Diagram below shows two balloons, J and K are filled with air and hung in balance, balloon K is pricked with a pin through the cellophane tape.

(a) Write the change for balloon J and KBalloon J: ___________________________________________________________________

Balloon K: __________________________________________________________________[2 marks]

(b) Briefly explain your answer in (a) ______________________________________________________________________________________________________________________________________________________

[1 mark](c) Why is balloon K pricked through the cellophane tape?

______________________________________________________________________________________________________________________________________________________[

1 mark](d) What conclusion can be drawn from this activity?

______________________________________________________________________________________________________________________________________________________[

1 mark](e) State one property of that air that is not studied in this activity.

___________________________________________________________________________[1 mark]

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3. Icebergs are very large pieces of floating ice found in the Arctic.

(a) Why is an iceberg able float in water? __________________________________________________________________________________________________________________________________________________________

[1 mark](b) The diagram below shows that a lump of plasticine sinks in water. When the same plasticine

moulded into shape of a boat, it floats in water.

(i) By using the concept of density, explain why the plasticine that has been moulded can float in water.__________________________________________________________________________________________________________________________________________________________________________________________________________________

[4 marks](ii) State one application that uses the same principle as in (b) (i).

______________________________________________________________________[1 mark]

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4. Read the passage.

When chemical from food or other substances enter the nose, they dissolve in the mucus and stimulate the sensory cells. Then the sensory cells send nervous impulses to the brain. The brain interprets the impulses and tells us the smell.

(a) Complete the following chat to show the nervous pathway for detecting smell.

[3 marks]

(b) Suggest, with explanation, how you can protect your nose and sense of smell. ____________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________________

[2 marks]

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(c) Mr. Hashim is working in a pain factory. As he works he smells the pungent paint. What are the risks faced by Mr. Hashim if he works in the factory for a long time? _________________________________________________________________________________________________________________________________________________________________________________________________________________________________

[1 mark]

5. (a) (i) The diagram below shows the structure of the human ear.

On the above diagram, tick (/) the correct letters to show the organs that are involved in the mechanism of hearing.

[3 marks]

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(ii) Tick (/) the functions of the part labeled B.

[2 marks]

(b) Mirah feels dizzy when she spins quickly a few rounds as shown in the diagram below.

Tick (/) the part of the ear which is responsible for the occurrence

[1 mark]

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6. The diagram below shows two animals which have different type of vision.

(a) Based on the diagram shown above, state the type of vision of animal J and animal K

J: ___________________________________

K:___________________________________[2 marks]

(b) Name another animal which have the same type of vision of animal J and animal K.

J: ___________________________________

K:___________________________________[2 marks]

(c) The diagram below shows that an owl is hunting.

Explain how the vision of the owl helps it in hunting._____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________8

[2 marks]7. The diagram below shows the apparatus set up to investigate and identify the stimuli detected by

the plants.

(a) In the diagram below, draw the direction of growth of the roots after one week.

[2 marks]

(b) What type of response is shown by the plant based on the answer in (a)?

____________________________________________________________________________

[1 mark]

(c) State the importance of the response to the plant.

_____________________________________________________________________________

[1 mark]

(d) Name another stimulus which the roots of plants respond positively to and why it is important

to plant?

_____________________________________________________________________________

_____________________________________________________________________________

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[2 marks]

8. According to the National Health Service, UK, the average male adult needs approximately 2 500

calories per day to keep his weight constant , while the average adult female needs 2 000. The

piechart below gives you an idea of how many calories you should consume each day.

(a) (i) The pie chart shows that the most calories are contributed by X. What is X?

_____________________________________________________________________________

[1 mark]

(ii) What percentage of calories is contributed by protein?

_____________________________________________________________________________

[1 mark]

(iii) Proteins are a class of food needed. State the functions of proteins in the body and the

effect of a lack of protein.

_____________________________________________________________________________

_____________________________________________________________________________

[2 marks]

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(b) The diagram below shows a boy eating fast food.

Explain what may happen to the boy if his diet continues?

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

[2 marks]

9. (a) The table below shows two body fluids and their pH and effects on litmus paper.

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The diagram below shows the human digestive system.

(i) Write in the above diagram, the letters A and B to show the organs which contain the

body fluids.

[2 marks]

(ii) Give reasons for your answer.

________________________________________________________________________

________________________________________________________________________

[2 marks]

(b) Study the statement below.

Suggest how the gastric pain problem can be overcome. Explain your answer.

______________________________________________________________________________

______________________________________________________________________________

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Gastric pain is commonly used to describe pain or discomfort in the upper abdomen. The patient may suffer from heartburn, bloating and nausea.

______________________________________________________________________________

______________________________________________________________________________

[2 marks]

10. Whales and sharks are animals that live in the sea. However, these two animals are placed in

different classes. A whale is mammal, whereas a shark is a fish.

(a) State two characteristics which differentiate a whale from shark.

___________________________________________________________________________

___________________________________________________________________________

___________________________________________________________________________

[2 marks]

(b) The blue whale is the biggest creature that exists on the Earth. This animal is almost extinct

due to hunting activities.

(i) What is the effect of extinction of this animal on biodiversity?

________________________________________________________________________

________________________________________________________________________

________________________________________________________________________

[2 marks]

(ii) Suggest two ways to preserve and protect the blue whale from becoming extinct.

________________________________________________________________________

________________________________________________________________________

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________________________________________________________________________

________________________________________________________________________

[2 marks]

11. Read the passage.

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Digestion is the braking down of food into simples form so that can be absorbed into the bloodstream. Digestion occurs in along alimentary canal. Digestion of carbohydrate begins in the mouth where amylase enzyme breaks down starch into glucose. When we swallow, food passes into the oesophagus by peristalsis. Peristalsis pushes the food into the stomach. Digestion of protein begins in the stomach where protease enzyme in gastric juice digests proteins into polypeptides. The stomach also secretes hydrochloric acid to kill the germs and microorganism in food. Duodenum is the first part of small intestine. It receive bile from the gall bladder and pancreatic juice from pancrease. Pancreatic amylase breaks down starch into maltose, lipase enzyme break down fats into glycerol and fatty acid and protease enzyme breaks down protein into polypeptides. The digestion of food is completed in the small intestine. Food that enters the ileum is mixed with the intestinal juice. The intestine juice contains amylase, protease and lipase enzymes. Amylase enzyme breaks down maltose into glucose, protease enzyme breaks down polypeptide into amino acids while lipase enzyme breaks down fats into fatty acid and glycerol. Undigested food will be transported to the large intestine. In this part, the reabsorption of water takes place. After the water is reabsorbed , the undigested food turns into faeces and they are stored in the rectum. The feaces are then expelled from the body through the anus.

(a) Complete the flow of food below during the digestion process.

[3 marks]

(b) Name the three enzymes produced by the pancreas. State the function of each enzyme.

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

[3 marks]

(c) Bile is an alkaline greenish fluid produced by the liver. What will happen if the liver fails to

secrete bile properly in the body?

______________________________________________________________________________

______________________________________________________________________________

[2 marks]

(d) Cancer of large intestine occurs due to the accumulation of toxic faeces in the large intestine for

a long period of time. Suggest one way to avoid the disease and state the reason for your

suggestion.

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______________________________________________________________________________

______________________________________________________________________________

[2 marks]

12. A company has released a strawberry-based beverage product. Here is a statement released by

the company.

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(a) Do you agree with the statement given by the company? Justify your opinion with supported

evidences.

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

[3 marks]

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(b) Puan Mirza suffers from high cholesterol in the blood. Suggest two ways to reduce her

cholesterol levels.

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

[2 marks]

(c) Heart patients with high cholesterol levels should watch their diets in order to control the

cholesterol level. Based on your understanding, plan a menu appropriate to this patient.

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

______________________________________________________________________________

[3 marks]

(d) Beside strawberries, state another two foods that rich with vitamin C.

______________________________________________________________________________

______________________________________________________________________________

[2 marks]

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13. Humans are complex multicellular organism because they have different types of cells that are

organized into cells, tissues, organs and systems.

(a) Based on the level of cell organization in human given:

(i) Name two other organs which form the digestive system and state their function.

________________________________________________________________________

________________________________________________________________________

[4 marks]

(ii) Name another system in the human body and state its function.

________________________________________________________________________

________________________________________________________________________

[2 marks]

(b) Every system in the human body should be looked after carefully so that the life processes can

be carried out undisturbed and the person can live well. Describe the actions that need to be

taken to keep the body system healthy.

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

_____________________________________________________________________________

[4 marks]

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14. During breakfast, Intan used a white glass, while Huda used a black glass. After 15 minutes,

they found that the water in the black glass cooled faster than the water in the white glass.

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(a) (i) From the investigation, predict which conical flask will have a lower temperature after 15

minutes. Give your reason.

_____________________________________________________________________________

____________________________________________________________________________

[2 marks]

(ii) What will happen if the conical flask is not painted black?

___________________________________________________________________________

___________________________________________________________________________

[1 mark]

(iii) What is the purpose of putting the conical flasks on the asbestos surface?

___________________________________________________________________________

___________________________________________________________________________

[1 mark]

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(b) The graph shows the change in the temperature of the hot water with time.

Describe about the radiation of heat which occurs in this situation.

____________________________________________________________________________

_____________________________________________________________________________

[2 marks]

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(c) The diagram below shows the structure of a thermos flask.

(i) Explain briefly hoe each labeled part in the diagram shown above helps in maintaining

the temperature of the water contained in the flask.

P: _____________________________________________________________________

Q: _____________________________________________________________________

R:______________________________________________________________________

[3 marks]

(ii) Why are both walls of the thermos silver –coated?

________________________________________________________________________

________________________________________________________________________

[1 mark]

END OF QUESTION PAPER

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