1st sem exam 2011 4A p2

8/6/2019 1st sem exam 2011 4A p2

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SEKOLAH ISLAM ADNIFirst Semester Examination 2011

Biology – Paper 2

Secondary 4 (KBSM)

INFORMATION FOR CANDIDATES

1. This question paper consists of two sections: Section A and Section B.

2. You are advised to spend 90 minutes to answer questions in Section A and 60

minutes for Section B.

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Biology – Paper 2

Secondary 4 (KBSM)

Section A

[60 marks]

Answer all questions in this section.

1 Diagram 1 shows a plant cell, P and animal cell, Q.

Diagram 1

(a) On the cells P and Q, label the cell membrane, the nucleus and the cytoplasm.

[3 marks]

(b) Name two structures in cell P which cannot be found in cell Q.

(i) ....................................................

(ii) ....................................................

[2 marks]

(c) What is the function of the cell membrane?

..........................................................................................................................................

[1 mark ]

(d) (i) Name the system in which cell Q is found in the human body.

....................................................................................................................................

[1 mark ]

(ii) What is the function of cell Q?

....................................................................................................................................

[1 mark ]

2

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Biology – Paper 2

Secondary 4 (KBSM)

(e) (i) Name structure X.

....................................................................................................................................

[1 mark ]

(ii) What is the function of X in cell Q?

....................................................................................................................................

[1 mark ]

(iii) In the space provided below, draw and label structure X as seen under the

electron microscope.

[2 marks]

3

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Biology – Paper 2

Secondary 4 (KBSM)

2 Diagram 2 shows the structure of a plasma membrane.

Diagram 2

(a) Name the parts labelled A to E .

A: .................................................. D: ..................................................

B: .................................................. E : ..................................................

C : ..................................................

[5 marks]

(b) (i) On which side of the membrane, X or Y , shown in Diagram 2, is the cytoplasm of

the cell?

....................................................................................................................................

[1 mark ]

(ii) Give one reason for your answer based on the evidence in Diagram 2.

....................................................................................................................................

[1 mark ]

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Biology – Paper 2

Secondary 4 (KBSM)

(c) State the functions of three named components of plasma membrane.

(i) Component 1: Glycolipid

Function: ....................................................................................................................

[1 mark ]

(ii) Component 2: Carrier protein

Function: ....................................................................................................................

[1 mark ]

(iii) Component 3: Cholesterol

Function: ....................................................................................................................

[1 mark ]

(d) The properties of the components of plasma membrane determine whether molecules

can pass through membranes.

Explain why plasma membrane is not permeable to most molecules.

..........................................................................................................................................

..........................................................................................................................................

[2 marks]

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Biology – Paper 2

Secondary 4 (KBSM)

3 Diagram 3 shows the structures of protein. The protein structures can be classified into

four levels, J, K, L and M based on the organisation of their structures.

Diagram 3

(a) (i) Label X for amino acid and Y for peptide bond in J in Diagram 3. [2 marks]

(ii) Name the protein structures of L and M.

L: …………………………………………………………………………………...

M: …………………………………………………………………………………..

[2 marks]

(b) (i) Name the organelle in the cell where the protein is synthesised.

………………………………………………………………………………………

[1 mark ]

(ii) Name the process P in the following reaction.

P: ……………………………………………………………………………………

[1 mark ]

(iii) Which of the structures, J, K, L or M is represented by:

an enzyme? : …………………………………………………………

haemoglobin? : …………………………………………………………

[2 marks]

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Biology – Paper 2

Secondary 4 (KBSM)

(c) Explain why food should be kept in the refrigerator.

..........................................................................................................................................

..........................................................................................................................................

..........................................................................................................................................

[2 marks]

(d) A detergent for washing clothes contains enzymes. It recommends that clothes should

be washed at 40°C. Explain why.

..........................................................................................................................................

..........................................................................................................................................

[2 marks]

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Biology – Paper 2

Secondary 4 (KBSM)

4 Enzymes are used in biological detergents.

(a) Name the type of enzyme that digests stains containing:

(i) fats: …………………………………………………………………………..

(ii) blood: …………………………………………………………………………..

[2 marks]

(b) A new detergent was recently manufactured by a factory. The performance of the new

detergent was compared to the existing detergent. The time taken by the two

detergents to remove a fat stain at different temperatures was measured. The graph in

Diagram 4 shows the results of the investigation.

Diagram 4

(i) Describe the effect of temperature increase on the time taken by the existing

detergent to remove the stain.

....................................................................................................................................

………………………………………………………………………………………

………………………………………………………………………………………

[2 marks]

(ii) Explain the difference in effectiveness of removing stains between the new

detergent and existing detergent.

………………………………………………………………………………………

………………………………………………………………………………………

[1 mark ]

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Biology – Paper 2

Secondary 4 (KBSM)

(iii) The new detergent is labelled as ‘environmentally friendly’. Explain why.

....................................................................................................................................

………………………………………………………………………………………

………………………………………………………………………………………

[2 marks]

(c) Both detergents do not work well at 60°C. Explain why.

…………………………………………………………………………………………..

..........................................................................................................................................

..........................................................................................................................................

[2 marks]

(d) Explain the specificity of enzymes.

..........................................................................................................................................

..........................................................................................................................................

..........................................................................................................................................

..........................................................................................................................................

[3 marks]

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Biology – Paper 2

Secondary 4 (KBSM)

5 Diagram 5 shows a food pyramid.

Diagram 5

(a) A, B, C and D are the different classes of food that make up the balanced diet.

(i) Name the class of food labelled C and D.

C: …………………………………………………………………………………...

D: …………………………………………………………………………………..

[2 marks]

(ii) State two functions of food in class C.

………………………………………………………………………………………

………………………………………………………………………………………

[2 marks]

(b) Too little of food from class B in our diet over a long period will give rise to health

problems. Explain why.

..........................................................................................................................................

..........................................................................................................................................

..........................................................................................................................................

..........................................................................................................................................[4 marks]

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Biology – Paper 2

Secondary 4 (KBSM)

(c) What disease is caused by deficiency of each of the following vitamins?

(i) Vitamin B1 (thiamine) : …………………………………………………………

(ii) Vitamin C : …………………………………………………………

[2 marks]

(d) Give one symptom of each of the diseases named in (c).

(i) ………………………………………………………………………………………

(ii) ………………………………………………………………………………………

[2 marks]

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Biology – Paper 2

Secondary 4 (KBSM)

Section B

[40 marks]

Answer any two questions in this section.

6 (a) Diagram 6 shows a mature red blood cell, a motor neurone and a spermatozoon

(sperm).

Diagram 6

State how the structures are adapted to their functions. [10 marks]

(b)

(i) Based on the statement given above, describe how Amoeba can carry out the

following life processes: nutrition, reproduction and sensitivity towards acid.

(ii) Explain why Amoeba does not require organ systems such as the respiratory

system found in multicellular organisms.

[10 marks]

12

Amoeba is a unicellular organism but it can function as a complete unit of life.

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Biology – Paper 2

Secondary 4 (KBSM)

7 Two experiments were carried out to study two processes.

Diagram 7.1 and Diagram 7.2 show the experimental set-ups at the beginning of the

experiments.

Diagram 7.1 Diagram 7.2

(a) (i) What are the two processes studied in Diagram 7.1 and 7.2? [2 marks]

(ii) Draw and label two diagrams to show the expected results at the end of the two

experiments respectively. [2 marks]

(iii) Explain the observations at the end of these experiments. [6 marks]

(b) Diagram 7.3 shows a food preservation technique.

Diagram 7.3

Explain the principles applied in each step of this food preservation technique.

[5 marks]

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Biology – Paper 2

Secondary 4 (KBSM)

(c) Diagram 7.4 shows the level of two sucrose solutions at different concentrations in a

U-tube at the beginning of an experiment.

Diagram 7.4

Draw a diagram to show the observation at the end of the experiment. Explain your

observation. [5 marks]

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Biology – Paper 2

Secondary 4 (KBSM)

8 Sucrose and glycogen are carbohydrates from which our body obtains energy.

(a) What is carbohydrate? [2 marks]

(b) Name the three different classes of carbohydrates. Give an example of each of the

named class and its function. [9 marks]

(c) How is a complex carbohydrate broken down into simple sugars? Explain with at

least one example. [5 marks]

(d) How do you identify whether starch and reducing sugars are present in an unknown

sample of food? Explain. [4 marks]

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8/6/2019 1st sem exam 2011 4A p2



Biology – Paper 2

Secondary 4 (KBSM)

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1st sem exam 2011 4A p2