JUNIOR SECONDARY SEMI-EXTERNAL EXAMINATION

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JUNIOR SECONDARY SEMI-EXTERNAL EXAMINATION

LIFE SCIENCE

WRITTEN PAPER Marks 130

No Additional Materials are required:

Multiple-choice answer sheet Non-programmable calculator Soft clean eraser Soft pencil (type B or HB)

2 hours 30 minutes

Specimen Paper

INSTRUCTIONS AND INFORMATION TO CANDIDATES

SECTION A Make sure you received the multiple-choice answer sheet (page 31). There are thirty questions. Answer all questions

SECTION B

Write your answers on the Question paper in the spaces provided.

Answer all questions. Write in dark blue or black pen. Use pencil for diagrams, graphs or rough working. Do not use correction fluid. You may use a Non-programmable calculator The number of marks is given in brackets [ ] at the end of each

question or part question.

Marks

This document consists of 31 printed pages and 1 blank page.

Republic of Namibia MINISTRY OF EDUCATION, ARTS AND CULTURE

?MoEAC/NIED

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SECTION A

Answer all questions. For each question there are four possible answers, A, B, C, and D. Choose the one you consider correct and record your choice in soft pencil on the multiple-

choice answer sheet. Each question counts one mark. If you want to change an answer, thoroughly erase the one you wish to delete.

1 Which component is destroyed in people who are HIV positive?

A lymphocytes B phagocytes C platelets D red blood cells

2 What is a disease causing organism? A antibody B host C pathogen D phagocyte

3 Which disease exhibits all of the following features?

It can be transmitted by animals to other animals, including humans. One mode of transmission is by transfusion with contaminated blood. The causative organism can show multiple drug resistance. The majority of humans who die from the disease are children.

A cholera B HIV / AIDS C malaria D tuberculosis

4 Which statement about both B-lymphocytes and T-lymphocytes is correct? A They become active only when a specific antibody binds to their surface receptor. B They divide to form clones when meeting an antitoxin in a cell. C They produce memory cells to respond to an antigen when exposed in the future. D They release hormone-like cytokines which stimulate release of antibodies.

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5 The list shows actions numbered 1, 2, 3 and 4.

1 washing hands after going to the toilet 2 disposing of waste frequently 3 using separate cutting boards for meat and salad 4 disposing of raw sewage into a river

Which of the actions 1, 2, 3 and 4 would help control the spread of disease? A 1, 2, 3 and 4 B 1, 2 and 3 only C 2 and 3 only D 4 only

6 The picture shows an animal.

What is the name of this animal according to the binomial system? A Catus B Felisleo C Male African lion D Top African jungle carnivore

7 The diagram shows a fish.

Which key identifies the fish? 1 black stripe across the eye .............................. go to 2 no black stripe across the eye ............................. A 2 black stripe on caudal fin ................................ go to 3 no black stripe on caudal fin ............................... B 3 black spot below dorsal fin .............................. C no black spot below dorsal fin ............................ D

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4 8 A student investigates osmosis in potatoes. He set up the apparatus shown.

At the beginning the potato cylinders were exactly balanced. He immersed the cylinders into the liquids for 4 hours. After 4 hours, he lifted the potato cylinders out of the liquids. Potato cylinder P was now heavier than potato cylinder Q.

Which statement explains what happened?

A Water moved into both potato cylinders P and Q. B Water moved out of both cylinders P and Q. C Water moved into the potato cylinder P and out of the potato Q. D Water moved out of the potato cylinder P and into the potato cylinder Q.

9 Which observations suggest that a cell is eukaryotic?

Key = found in eukaryotes = not found in eukaryotes

cytoplasm includes endoplasmic reticulum

protein molecules are ribosomes distributed associated with the through the cytoplasm DNA

A

B

C

D

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5 10 The diagram shows a sample of material taken from an organism.

A cell B organ C organ system D tissue

11 Which substance is transported by xylem vessels?

A carbon dioxide B oxygen C sugar D water

12 Which of the four vertebrates in the table is a mammal?

scaly skin

hair

four limbs

tail

A

B

C

D

13 What are the chemical elements found in carbohydrates?

A carbon, hydrogen and oxygen B carbon, hydrogen, oxygen and nitrogen C carbon, hydrogen, oxygen and sulfur D carbon, hydrogen, oxygen, nitrogen and sulfur

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14 The table shows the mass of some nutrients found in 100 g of four different foods.

food carbohydrate / g fat / g protein / g vitamin C / mg vitamin D / mg

beans

10.0

0.4

5.0

3.0

0.0

bread

48.0

1.5

9.0

0.0

0.0

cheese

0.0

34.0

25.0

0.0

0.4

eggs

0.0

11.0

13.0

0.0

1.5

Which foods would best prevent rickets and scurvy?

rickets

scurvy

A

beans

bread

B

bread

cheese

C

cheese

eggs

D

eggs

beans

15 What is a symptom of scurvy?

A bleeding gums B breathlessness C diarrhoea D pain in joints

16 A person has been smoking heavily for many years. A lot of dust and micro-organisms enter their lungs.

Which statement explains why this occurs?

A Their arteries are blocked with tar. B The cilia in the trachea have been destroyed. C The person is addicted to nicotine. D The surface area of the lungs is reduced.

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7 17 Which features are present in gaseous exchange surfaces?

large surface area

A

B

C

D

moist

thick walls

18 Which of the following are found in blood and lymph and tissue fluid?

1 carbon dioxide 2 fatty acids 3 white blood cells 4 proteins

A 1, 2, 3 and 4 B 1, 2 and 3 only C 1, 2 and 4 only D 3 and 4 only

19 Why is the inner lining of the bronchiole folded?

A to allow for expansion during breathing B to facilitate gaseous exchange C to increase the surface area D to trap foreign particles

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20 The diagram shows cross-sections of three types of blood vessel. What is the identity of the three vessels?

NOT DRAWN TO THE SAME SCALE

artery capillary vein

A

X

Y

Z

B

Y

X

Z

C

X

Z

Y

D

Y

Z

X

21 The diagram shows some of the structures found in the human abdomen.

What type of structures are X and Y?

X

Y

A

organ

organ

B

organ

organ system

C organ system

tissue

D

tissue

organ system

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