CAMI EDUCATION. Complete the following sentences by writing the missing word next to the question number ( )

Transcription

1 CAMI Education (Pty) Ltd Reg. No. 1996/017609/07 CAMI House Fir Drive, Northcliff P.O. Box 1260 CRESTA, 2118 Tel: +27 (11) Fax : web: info@camiweb.com CAMI EDUCATION NATURAL SCIENCE GRADE 7 NOVEMBER 2011 MARKS: 100 TIME: 1,5 HOURS QUESTION 1: ONE WORD ITEMS Complete the following sentences by writing the missing word next to the question number ( ) 1.1 A liquid can be separated from a mixture of liquids in a solution by means of. (1) 1.2 is the third planet from the sun. (1) 1.3 In a generator, kinetic energy is transformed into energy. (1) 1.4 A spider is an example of an. (1) 1.5 The is the layer in the atmosphere that is closest to the earth s surface. (1) [5]

2 QUESTION 2: MULTIPLE CHOICE QUESTIONS Four possible options are provided as answers to the following questions. Each question has only ONE correct answer. Choose the correct answer and write only A, B, C or D next to the question number ( ). 2.1 One of the best solutions to get rid of non-biodegradable wastes is: Burning it Dumping it Burying it Recycling (2) 2.2 What is Saturn mainly made from? Water Gas Rock Metal (2) 2.3 A meteorite is: a meteor that hits the earth an asteroid which hits the sun a type of rock a subterranean nuclear force (2) 2.4 What do all vertebrates have in common? They live on land. They all have a hard internal skeleton or backbone. They all have legs. They are all warm blooded. (2)

3 2.5 A scorpion is a member of which invertebrate family? Mammals Insects Arachnids Crustaceans (2) [10] QUESTION 3 The diagram above shows two green ink spots placed on a filter paper and then placed in a suitable solvent. 3.1 What is Paper Chromatography? (2) 3.2 Explain what causes the different coloured spots on the filter paper. (2) 3.3 What do the different colour spots tell you about the composition of the two green spots? (2) 3.4 Name two uses of paper chromatography. (2) [8]

4 QUESTION The earth has a layered structure. Name the three layers that the earth consists of. (3) 4.2 Give an estimation of the thickness of the lithosphere or crust of the earth. (1) 4.3 What do we call the thick, warm liquid rock that is found in the mantle? (1) 4.4 Give an approximate temperature value for the core of the earth. (1) [6] QUESTION This diagram shows the position of the Earth for each of the four seasons. Write down the corresponding season, experienced in South Africa, next to each of the letters (A D). (4) 5.2 What is the main cause for the formation of seasons? (1) 5.3 Name the two main ways in which a planet moves. (2) 5.4 How long does it take the earth to complete one full rotation around its own axis? (1) 5.5 Explain what happens during a solar eclipse. (2) [10]

5 QUESTION Wind is a renewable energy source. Name three disadvantages of using wind as an energy source. (3) 6.2 Name three main advantages that renewable energy resources have over non-renewable resources for electricity generation. (3) 6.3 Explain why wood is seen as a renewable resource? (1) [7] QUESTION What is energy efficiency? (2) 7.2 What is the main disadvantage of heating a small pot on the large element of a stove? (1) The main heat energy losses from a house are shown in the diagram. 7.3 Calculate the percentage heat energy loss through the walls by using the diagram. (2) 7.4 Complete the table below to show how the heat energy loss from each part of the house can be reduced. The first one has been done for you. Part of the house Method used for reducing heat energy loss roof Fiberglass insulation in the loft walls floor (2) [7]

6 QUESTION 8 The following diagram shows a baby in its mother s womb 8.1 What is the normal length of human pregnancy in weeks? (1) 8.2 What is the function of the amniotic fluid around the foetus? (1) 8.3 When a baby is born, it is pushed out of the mother s body. Look at the diagram and explain what happens to the wall of the uterus to push the baby out. (2) 8.4 How is oxygen supplied to the foetus while still in the mother s womb (3) 8.5 Which named part in the diagram above can transfer alcohol to the foetus? (1) 8.6 The placenta is connected to the foetus by blood vessels that run through the. (1) 8.7 The is a bag that contains a liquid and surrounds the foetus to protect it. (1) [10]

7 QUESTION 9 The drawing shows a plant, which reproduces vegetatively. 9.1 What is vegetative propagation? (2) 9.2 Name two advantages of vegetative reproduction. (2) 9.3 What will need to happen before each of the shoots become independent plants? (1) 9.4 What name is given to the horizontal stem in this kind of propagation? (1) 9.5 Name a commercially grown fruit whose plants are propagated in this way. (1) [7] QUESTION Name three dispersal agents that assist in the dispersal of seeds. (3) 10.2 Name two ways in which a seed is adapted to be dispersed by wind. (2) [5]

8 QUESTION Into which two main groups can animals be divided? (2) 11.2 Name the five classes of vertebrates. (5) 11.3 Which of the vertebrate classes: are warm-blooded? reproduce by laying eggs? (1) (1) 11.4 Give three characteristics of all birds. (3) 11.5 Fishes can be sub divided into 3 groups. Name these groups. (3) 11.6 Describe a cartilaginous fish by referring to its skeleton and skin. (3) [18] QUESTION List three characteristics of an insect. (3) 12.2 Describe the life cycle of a bee. (4) [7] TOTAL: 100