Biology 2009 PNEB (PUNTLAND NATIONAL EXAMINATION BOARD)

Name .............................................................

School ..................................…………………

Roll Number.........................………………….

Puntland State of Somalia

Ministry of Education

Puntland National Examination Board

Form 4 BIOLOGY Examination

2009

Time 2 hours

Plus 10 minutes before the exam for reading through the paper

TOTAL TIME 2 hours 10 minutes

INSTRUCTIONS TO CANDIDATES This paper consists of 18 printed pages

Count them now. If there are any missing, inform the invigilator

There are two parts:

SECTION A – Multiple Choice Questions 10 Marks SECTION B – Structured Questions 90 Marks TOTAL 100 Marks

• Answer all questions

• All answers and working must be written on this paper in the spaces provided

immediately after each question

• No extra paper is allowed. Rough work can be done on page 2. This will not be marked

• If you make a mistake, cross out the incorrect answer and clearly write your correct

answer.

Puntland State of Somalia Secondary School Form Four Examination Puntland Certificate of Education Biology Examination June 2009

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Use This Page for Rough Work, It Will Not

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Be Marked


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SECTION A: MULTIPLE CHOICE QUESTIONS (10 MARKS) Instructions for this section: For each question in this section, circle the correct answer

For each question there is only one correct answer

Each question carries one mark

If the examiner thinks you have marked two answers, you will not receive a mark for

that question.

1. In a food chain, plants are

A. decomposers

B. primary consumers

C. secondary consumers

D. producers

2. In the human sperm cell below, circle the letter that represents the nucleus.

D


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3. In which part of alimentary canal is starch digested?

A. Ileum

B. Duodenum

C. Mouth

D. Rectum

4. Which mechanism is used by green plants for excretion of their waste products?

A. Deposition

B. Agglutination

C. Osmosis

D. Homeostasis

5. Identify the type of nerve cell shown below;

A. Sensory neuron

B. Motor neuron

C. Relay neuron

D. Receptor neuron


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6. Which organelle acts as site for energy production in a cell?

A. Mitochondrion

B. Chloroplasts

C. Cell wall

D. Lysosomes

7. Which of the following does not belong to order arachnid?

A. Scorpions

B. Ticks

C. Centipedes

D. Spider

8. What is the function of chloroplasts?

A. Protein synthesis

B. Photosynthesis

C. Movement

D. Respiration

9. The process below shows how food moves down the gut due to contractions. This is

referred to as?

A. Peristalsis

B. Absorption

C. Digestion

D. Osmosis


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10. The male reproductive part of a flower is called?

A. Pistil

B. Stamen

C. Petals

D. Sepals

SECTION B (90 MARKS)

Question 1. (10 marks) The body temperature of a normal child was taken for a period of 10 hours

during the day. The data is shown below.

Time (hour) Temperature (0

1 38.2

C)

2 38.2

3 39.0

4 40.0

5 42.0

6 40.0

7 38.7

8 38.6

9 38.4

10 38.2

i. On the grid provided, plot the graph of temperature against time. (5 marks)


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ii. Suggest the possible normal body temperature for the child? (1mark)

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iii. State any two factors that may have caused changes in body temperature at the 4th and

5th

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hours? (2 marks)

iv. Describe how an increase of sweat causes the temperature to drop back to normal

between 7th to 10th

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hours? (2 marks)

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Question 2. (6 marks) A form two class set up the apparatus shown below to demonstrate the breathing

mechanism in a mammal.

a) What structure in a mammal’s respiratory system, is represented by each of the

following:

i. the glass tube? (1 mark)

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ii. the balloons? (1 mark)

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iii. the bell jar? (1 mark)

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iv. the rubber sheet? (1 mark)

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b) Explain what will happen to the rubber balloons if the rubber sheet is pulled

downwards. (2 marks)

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Question 3. (6 marks) The diagram below represents a feeding relationship in an aquatic ecosystem.

a) Name the:

i. Producers in this ecosystem. (1mark)

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ii. Organisms that occupy the highest tropic level. (1mark)

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b) Write a food chain that ends with the hawks as a tertiary consumer. (2 marks)

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c) State two short term effects if all the frogs die in this ecosystem. (2 marks)

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Question 4. (5 marks)

i). Name the organism that causes each of the following diseases. a) Cholera ……………………………………………………. (1mark)

b) AIDS ……………………………………………………. (1mark)

c) Bilharzia …………………………………………………... (1mark)

ii) List two ways, other than sexual intercourse, by which HIV can be transmitted.

(2 marks)

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Question 5 (7 marks) a) The bar chart below shows the percentage of dark-and light colored moths in two

different towns. The dark colored moths are better camouflaged in polluted areas

whereas the light colored variety are better camouflaged in unpolluted areas.

i. Which town is the most polluted? (1 mark)

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ii. Give a reason for your answer. (2 marks)

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b) Give four causes of water pollution. (4 marks)

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Question 6. (10 marks) The diagram below represents a cross-section through a part of the epithelium of human

ileum.

a) Identify the structure drawn above. (2 marks)

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b) Name the parts labeled (3 marks)

A ………………………………………………………

B ………………………………………………………

C ………………………………………………………

c) Briefly explain the functions of the parts; (2 marks)

B…………………………………………………………………………………………

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d) Outline the two features of structure that improves absorption (2 marks)

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e) What is the significance of the ileum being numerous? (1 mark)

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Question 7 (8 marks) a) A food sample was made into a suspension and a few drops of iodine were added into it.

A blue black color developed.

i. What type of food does the blue black colour indicate? (2 marks)

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ii. What is the main function of the food you have mentioned above in mammalian bodies?

(1 mark)

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b) The figure shows a longitudinal section through a broad bean seed.

i. Label parts A, B, C and D on the figure . (4 marks)

ii. Name the part of the flower in which the seed was formed. (1 mark)

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Question 8 (10 marks) Cystic Fibrosis is a disease caused by recessive alleles. F= the normal allele.

f = the faulty allele that leads to Cystic fibrosis.

The genetic diagram below shows the possible inheritance of cystic fibrosis from one

couple.

i. Complete the genetic diagram (3 marks)

ii. Which of the possible offspring will be unaffected? (2 marks)

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iii. What proportion of the possible offspring is homozygous? (2 marks)

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iv. Which of the possible offspring are carriers of the disease? (2 marks)

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Ff

F

FF

2 3 4

FF

Gamete

Parent

Offspring


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v. Explain why someone might want to be tested to see if they are a carrier for cystic

fibrosis. (1 mark)

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Question 9 (5 marks) The figure below shows the structure of a common mould.

a) Name the parts labeled:

S………………………………………………...

U…………………………………………………

T…………………………………………………

W…………………………………………………

(4 marks)

b) Name the type of nutrition exhibited by the mould. (1 mark)

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Question 10 (7 marks) The figure below shows an incomplete diagram of the female urinary system.

a) On the figure, draw and label the following parts:

Renal artery, urethra and ureter (3 marks)

b) Where is urine stored in the urinary system? (1 mark)

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c) Name three components that are present in the urine of a healthy person. (3 marks)

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Question 11 (7 marks) The diagram shows the female reproductive system.

a) Name the structures labeled A and B (2 marks)

A ……………………………….

B ……………………………….

b) Label the diagram:

i. Use letter F, to show where fertilization normally occurs. (1 mark)

ii. Use letter G, to show where gametes are produced. (1 mark)

iii. Use letter O, to show where oestrogen is produced. (1 mark)

c) List two secondary sexual characteristics in girls that are stimulated by oestrogen.

(2 marks)

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Question 12. (9 marks) Leaves are the most important organs of photosynthesis. The following diagram shows

what happens in a plant leaf during photosynthesis.

a) Give two ways in which leaves are adapted to absorb light. (2 marks)

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………………………………………………………………………………………………… b) Name gases labeled; (2 marks)

X ……………………………………………………………………………………………………

Y ……………………………………………………………………………………………………

c) Name the tissues which transport:

i. Water into the leaf (1 mark)

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ii. Sugars out of the leaf (1 mark)

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d) Write the equation of the process of photosynthesis. (3 marks)

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