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UHS | Grade 8 Mid-Year Examination 2015 1 NAME TEACHER’S COMMENT TEACHER CLASS PARENT’S COMMENT MARK PERCENTAGE PARENT’S SIGNATURE HERZLIA MIDDLE SCHOOL GRADE 8 NATURAL SCIENCE MID-YEAR EXAMINATION 3 JUNE 2014 TIME: 90 Minutes MARKS: 180

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Page 1: MARK PERCENTAGE PARENT’S SIGNATURE

UHS | Grade 8 Mid-Year Examination 2015 1

NAME TEACHER’S COMMENT

TEACHER

CLASS PARENT’S COMMENT

MARK

PERCENTAGE PARENT’S SIGNATURE

HERZLIA MIDDLE SCHOOL

GRADE 8

NATURAL SCIENCE MID-YEAR EXAMINATION

3 JUNE 2014

TIME: 90 Minutes

MARKS: 180

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UHS | Grade 8 Mid-Year Examination 2015 2

INSTRUCTIONS

1. There are 27 pages including a cover page, one Answer Sheet and a Periodic Table. Make sure you have all of them.

2. Answer all questions on the paper in blue or black ink.

3. Read each question carefully before answering it.

4. Pay attention to the mark allocation.

5. Plan your time carefully.

6. All the diagrams should be done in pencil and labelled in blue or black ink. Diagram rules must be followed.

7. Write neatly and legibly.

8. Use the Multiple Choice answer sheets for Question 1.

9. Write in full sentences. No one word answer will be accepted.

10. No colour or highlighter or shading may be used when drawing bar graphs.

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UHS | Grade 8 Mid-Year Examination 2015 3

MULTIPLE CHOICE ANSWER SHEET

NAME: Class:

Multiple Choice (use pencil only)

Choose the answer, which you consider most appropriate and cross the corresponding letter on this Answer Sheet.

e.g. If your answer to 1.3 is D, indicate your choice like this:

1.3 A B C D

If more than one cross appears in any line, the answer will be marked wrong.

1.1 A B C D

1.2 A B C D

1.3 A B C D

1.4 A B C D

1.5 A B C D

1.6 A B C D

1.7 A B C D

1.8 A B C D

1.9 A B C D

1.10 A B C D

1.11 A B C D

1.12 A B C D

1.13 A B C D

1.14 A B C D

1.15 A B C D

1.16 A B C D

1.17 A B C D

1.18 A B C D

1.19 A B C D

1.20 A B C D

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UHS | Grade 8 Mid-Year Examination 2015 4

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UHS | Grade 8 Mid-Year Examination 2015 5

SECTION A (LIFE & LIVING AND MATTER & MATERIALS) 60

QUESTION 1 MULTIPLE CHOICE 40

Four options are provided as possible answers to the following questions. Each question has only ONE correct answer. Mark this in the appropriate place on the Answer Sheet provided.

1.1 Look at the food chain shown below and choose what X could be: (2)

Restio → zebra cockroach → X → Cape Cobra → Grey Mongoose

A an Agama lizard

B an ant

C seaweed

D grass

1.2 Respiration produces: (2)

I nitrogen II oxygen III carbon dioxide IV starch

A I

B I and III

C I and II and III

D III

1.3 The study of the interactions between living things and their environment is called …

(2)

A ecology

B a habitat

C an ecosystem

D biology

1.4 Organisms that breakdown dead organic matter are known as: (2)

A hunters

B consumers

C herbivores

D decomposers

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UHS | Grade 8 Mid-Year Examination 2015 6

1.5 To which main Fynbos plant family do the plants below belong? (2)

A Protea

B restios

C Erica

D geophytes

1.6 Breaking down a compound by passing current through it is called…

(2)

A electrolysis

B combustion

C explosion

D mixing

1.7 What particles make up the nucleus of an atom? (2)

A electrons

B protons

C neutrons

D protons and neutrons

1.8 How are compounds formed? (2)

A When different atoms react with each other.

B When you have atoms of the same kind reacting.

C When 2 atoms of different kind separate.

D When only 2 elements of the same kind react together.

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UHS | Grade 8 Mid-Year Examination 2015 7

1.9 An element is a pure substance because it has… (2)

A atoms of the same kind

B atoms of different kinds arranged in the same way

C atoms that are chemically joined

D atoms that are chemically bonded

1.10 What is the charge of a neutron? (2)

A positive

B negative

C No charge

D Both negative and positive

1.11 The diagram below that most clearly shows a gas is: (2)

A

B

C

D

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UHS | Grade 8 Mid-Year Examination 2015 8

1.12 The name “Fynbos” is believed to come from the…. (2)

A Greek word for vain, referring to vain bushes.

B German word for veins, because the twigs look like a vein network.

C Dutch word for fine (“fijn”), referring to the fine twigs that many Fynbos plants possess.

D Afrikaans word for hair, referring to the hair-like structures on the leaves of many Fynbos plants.

1.13 Which of the following combinations of factors are most closely associated with Fynbos?

(2)

A thorn trees (Acacias), African elephants and grasses

B sunbird, sand stone soil, restios

C clay soil, springbok, succulent plants

D Sandy soil, yellow wood trees and ferns

1.14 How many different kinds of elements are present in one molecule of sugar (C6H1206)?

(2)

A 2

B 3

C 4

D 24

1.15 The boiling point of pure water at sea level is: (2)

A 100°C

B 50°C

C 0°C

D 90°C

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UHS | Grade 8 Mid-Year Examination 2015 9

1.16 Which one of the following substances is classified as a mixture? (2)

A tap water

B gold

C oxygen

D carbon dioxide

1.17 Which one of the following is a pure substance consisting of identical compound molecules?

(2)

A pure oxygen

B wine

C pure water

D pure hydrogen

1.18 Which one of the following substances naturally occurs as a solid in nature?

(2)

A oxygen

B hydrogen

C carbon dioxide

D aluminum

1.19 Which of the following elements will form diatomic molecules?

A carbon

B sulphur

C helium

D chlorine

1.20 You can smell the food cooking from Jill’s tuckshop from the Science lab, mainly, due to:

(2)

A evaporation

B diffusion

C dissolving

D condensation

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UHS | Grade 8 Mid-Year Examination 2015 10

QUESTION 2 ONE WORD ANSWER 10

Give ONE word/term for each of the following descriptions. Write only the word/term next to the question number (2.1–2.10).

Do not give examples.

2.1 The fleshy cap of a Protea seed.

(1)

2.2 Reed-like plants found in Fynbos.

(1)

2.3 The study of an ecosystem.

(1)

2.4 The gas used by plants for photosynthesis.

(1)

2.5 Animals that eat plants.

(1)

2.6 The small holes on the base of a plant leaf.

(1)

2.7 Equal number of protons and electrons.

(1)

2.8 When we put different elements or compounds together and there is no chemical reaction.

(1)

2.9 Elements found on the left side of the Periodic Table.

(1)

2.10 Smallest particles in an atom.

(1)

QUESTION 3 MATCHING COLUMNS 10

Choose a term/phrase from COLUMN B that matches a term in COLUMN A.

Write only the letter (A – J) next to the question number (3.1 – 3.10).

COLUMN A COLUMN B

3.1 consumer A Makes its own food (1)

3.2 protea B Species that are not indigenous to an area (1)

3.3 Neon C Curled over needle-like leaves (1)

3.4 producer D Neutron number of 10 (1)

3.5 Oxygen E Fire resistant cone (1)

3.6 alien F Neutron number 8 (1)

3.7 erica G Unable to make its own food (1)

3.8 magnesium H Semi-metal (1)

3.9 omnivore I Metal (1)

3.10 silicon J Feeds on plant and animal matter (1)

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UHS | Grade 8 Mid-Year Examination 2015 11

SECTION B (LIFE & LIVING) 66

QUESTION 1 PHOTOSYNTHESIS AND RESPIRATION 8

The following questions are related to the ecosystem in the above photograph.

1.1 Describe the process of how the fynbos plants make starch (food).

(5)

1.2 How does the Cape Mountain Zebra get its nutrition? (1)

1.3 The process of respiration continually takes place in both the zebra and plants. Explain why.

(2)

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UHS | Grade 8 Mid-Year Examination 2015 12

QUESTION 2 FYNBOS ECOLOGY 36

2.1 Look at the Fynbos food web and answer the questions.

Peregrine falcon Berg adder

Cape rockjumper Rock agama

butterfly Protea beetle Chacma baboon

Red disa restio King protea

Give an example of each of the following from the food web:

2.1.1 a producer (1)

2.1.2 an omnivore (1)

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UHS | Grade 8 Mid-Year Examination 2015 13

2.1.3 Construct one food chain with four links from the food web. (4)

2.1.4 Explain why food chains usually begin with green plants. (2)

2.1.5 If all of the Red disas went extinct due to climate change, what would happen to the number of (state either increase or decrease):

(2)

2.1.5.1 butterflies

2.1.5.2 Peregrine falcons

2.2 If parts of the Table Mountain National Park were to be developed for a new housing project, explain how this would affect the fynbos ecology.

(2)

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UHS | Grade 8 Mid-Year Examination 2015 14

2.3 Define the term adaptation. (2 )

2.4 Give four ways in which Fynbos plants are adapted to survive summer fires.

(4)

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UHS | Grade 8 Mid-Year Examination 2015 15

2.5 Use the diagrams to help you to give five ways that fynbos plants are adapted to survive hot, dry summers.

(5)

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UHS | Grade 8 Mid-Year Examination 2015 16

2.6 Read the article taken from http://www.southafrica.info/news/fires-050315.htm#.VUcAgdyUdtw#ixzz3Z8zFAgD8 and answer the questions.

13

Cape fires are 'right on time' for fynbos, says UCT ecologist. By Helen Swingler 5 March 2015

As devastating as the ongoing fires around the Cape Peninsula have been to people’s property, regular fires every 15 years are critical to the rebirth of fynbos ecosystems, says fynbos ecologist Dr Adam West. "In the fynbos, fire is essential for maintaining the ecosystem and 15 years is an optimum time for fynbos to burn. In a sense, these fires are right on time; early enough to restore the plants that bind the soil before the winter rains erode (wash away) the land." Fynbos habitats have been burning every 15 years for between 3 and 5 million years, as long as fynbos has been around, says West. "The indigenous plants and animals from these systems are well adapted to these regular fires. If they couldn't handle it, there wouldn't be any left." Without fire, these ecosystems slowly detriorate, negatively affecting the plants, birds and animals whose life cycles and food chains are dependent on the fynbos. Ironically, it is the lack of fire that is the ultimate death sentence for fynbos ecosystems.

And although the fires have razed some homes and buildings in the affected areas of Tokai, Noordhoek, Muizenberg and Hout Bay, West has commended the City of Cape Town's urban planners for the strict regulations that limits development in the higher parts of the Peninsula's mountains, which skirt some of the city's largest tracts of conservation land. "Good urban planning can lessen the effects of devastating fires like these. And Cape Town's urban planners have done a good job by keeping development below the natural plant line. This gives firefighters a fixed line to defend." Unfortunately, developments such as the luxury Tintswalo Atlantic lodge, which was razed to the ground below Chapman's Peak, are "time bombs" in a region prone to fynbos fires, he says. "It's like building below the flood line of a river." Vineyards planted right up to the natural vegetation on the mountains also stand to be damaged by these fires. "Growing vineyards adjacent to naturally fire-prone vegetation is very risky.

2.6.1 Explain what an ecologist studies. (1)

2.6.2 What is the suggested time interval for fynbos to burn? (1)

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UHS | Grade 8 Mid-Year Examination 2015 17

2.6.3 Why does the author say that the recent Cape Peninsula fires where right on time? Give two reasons.

(2)

2.6.4 Name three Peninsula suburbs in which property was damaged due to the 2015 fires?

(3)

2.6.5 Give one way in which good Urban planning prevented worse damage being done to human property by the recent fires

(4)

2.6.6 Explain why the author says that the Tintswalo Atlantic lodge is a “time bomb”

(2)

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UHS | Grade 8 Mid-Year Examination 2015 18

2.6.7 Give TWO things that you can do to help the prevention of fires in Cape Town.

(2)

QUESTION 3 SCIENTIFIC INVESTIGATION/ MICROORGANISMS: YEAST 22

3.1 Darren performed an investigation to test how much gas was released when yeast was added to different sugar solutions. He used four 500ml Cola bottles. To each of these bottles he added a packet of yeast. Darren then added a different type of sugar to each one of three of the bottles, respectively. He did not add any sugar to the fourth bottle. He then added 300ml of 40oC pure water to all four of the bottles. A lid was placed tightly on the each of the bottles and then they were shaken for two minutes. After shaking the bottles, Darren placed a balloon over each. His results are pictured below.

No sugar 15ml white sugar 15ml glucose powder 15ml brown sugar

After 40 minutes, Darren tied the balloons off with string and submerged each one in a bucket of water to measure displacement. His results are shown in a table below:

Treatment

Water level before

submerging balloon

Water level after submerging

balloon

Difference in water level

No sugar 300ml 302ml

white sugar 300ml 340ml

Refined glucose powder

300ml 360ml

Brown sugar 300ml 320ml

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UHS | Grade 8 Mid-Year Examination 2015 19

3.1.1 Provide an aim for this investigation. (2)

3.1.2 Provide a hypothesis for this investigation. (2)

3.1.3 State the independent variable. (1)

3.1.4 State the dependent variable. (1)

3.1.5 Give three variables that must be kept the same. (3)

31.6 Give 2 ways in which Darren’s experiment is different to the one you did in the laboratory.

(2)

3.1.7 Which one of the four bottles is the control? Give a reason for your answer.

(2)

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UHS | Grade 8 Mid-Year Examination 2015 20

3.1.8 Name the gas given off into the balloons. (1)

3.1.9 To which kingdom of living organisms does yeast belong? (1)

3.1.10 Name the process that occurs when yeast brakes down sugar to release the gas mentioned in your answer to question 3.1.8

(1)

3.1.11 Complete the table by filling in the displacement values in the last column.

(4)

Treatment Water level before

submerging balloon Water level after

submerging balloon Difference in water

level

No sugar 300ml 302ml

white sugar 300ml 340ml

Refined glucose powder

300ml 360ml

Brown sugar 300ml 320ml

3.1.12 Based on the values in the last column name the treatment was responsible for the release of the most gas?

(1)

3.1.13 Give one possible reason for your answer in question 3.1.12 (1)

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UHS | Grade 8 Mid-Year Examination 2015 21

SECTION C (MATTER & MATTERIAL)-ATOMS AND MOLECULES/PARTICLE MODEL 52

QUESTION 1 The table below shows some popular substances that are used by people as fuels.

(11)

Fuel Uses

Hydrogen

Propane C3H8

Methane CH4

Butane C4H10

1.1 From the table select:

1.1.1 Any molecule of a compound (1)

1.1.2 An element that normally exists as a molecule (1)

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UHS | Grade 8 Mid-Year Examination 2015 22

1.2 Name an element that is found in all the substances listed in the table.

(1)

1.3 Name one use that Hydrogen, Methane and Propane have in common

(1)

1.4 Describe the structure of an atom. (4)

1.5 Tabulate two differences between compounds and mixtures. (3)

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UHS | Grade 8 Mid-Year Examination 2015 23

QUESTION 2 11

The table below shows some common compounds and their chemical formula. Complete the table.

(11)

Name of compound Elements in the

compound Formula of compound

Model

Methane CH4

water H2O

Sugar C6H1206

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UHS | Grade 8 Mid-Year Examination 2015 24

QUESTION 3 You performed an experiment in class to decompose copper chloride using elecrtrolysis.

10

Look at the diagram and answer the questions.

3.1

3.1.1 What are the electrodes made from? (2)

3.1.2 Name the electrolyte. (1)

3.1.3 What was observed on the positive electrode? (1)

3.1.4 What was observed on the negative electrode? (1)

Small light bulb

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UHS | Grade 8 Mid-Year Examination 2015 25

3.1.5 What element is formed at the negative electrode? (1)

3.1.6 What element is formed at the positive electrode (1)

3.1.7 What would be the purpose of the small bulb? (1)

3.2 Give the conclusion of the experiment. (2)

QUESTION 4 Potassium permanganate (KMnO4) is a dark purple solid. When it is heated, oxygen gas is released.

12

4.1 Draw a labeled diagram of the experiment that was set up and demonstrated by Mr Joseph. Your diagram must have the following labels: test tube, glowing splint, potassium permanganate crystals.

(6)

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UHS | Grade 8 Mid-Year Examination 2015 26

4.2 Describe briefly how the experiment for the test was done. (4)

4.3 What can you conclude about potassium permanganate based on this demonstration?

(2)

QUESTION 5 8

Complete the table comparing the particles of solids, liquids and gases.

(8)

Arrangement of particles

Movement of particles

Effect of attractive forces

between particles

Space between particles

Solids

Packed closely together;

arranged in an organized pattern

Held together

strongly

Liquids

More freely than solids slide past

each other; movements are

rapid

Gases Very large

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UHS | Grade 8 Mid-Year Examination 2015 27

I II Periodic Table of Elements III IV V VI VII O

1 4

H He

1 2

7 9 11 12 14 16 19 20

Li Be B C N O F Ne

3 4 5 6 7 8 9 10

23 24 27 28 31 32 35 40

Na Mg Al Si P S Cl Ar

11 12 13 14 15 16 17 18

39 40 45 64 65

K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr

19 20 21 29 30

108

Rb Sr Y Zr Nb Mo Te Ru Rh Pd Ag Cd In Sn Sb Te I Xe

47

197 201

Cs Ba La Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn

79 80

Fr Ra Ac