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NATURAL SCIENCE GRADE 8 – MODEL ANSWER (JUNE 2011)

NATURAL SCIENCE GRADE 8 – MODEL ANSWER (JUNE 2011). Question 1 1.1 Bunsen burner 1.6 Iris Diaphragm 1.2 Mitochondrion 1.7 Rotating nosepiece 1.3 Brain 1.8 Iodine 1.4 Bone 1.9 100 x 1.5 Differentiation TOTAL : 1 x 9 = 9. Question 2 TOTAL: 2 x 6 = 12 2.1 A 2.4 B

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NATURAL SCIENCE GRADE 8 – MODEL ANSWER (JUNE 2011)

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  1. NATURAL SCIENCE GRADE 8 – MODEL ANSWER (JUNE 2011) Question 1 1.1 Bunsen burner 1.6 Iris Diaphragm 1.2 Mitochondrion 1.7 Rotating nosepiece 1.3 Brain 1.8 Iodine 1.4 Bone 1.9 100 x 1.5 Differentiation TOTAL : 1 x 9 = 9 Question 2 TOTAL: 2 x 6 = 12 2.1 A 2.4 B 2.2 C 2.5 C 2.3 D 2.6 B

  2. Question 3 3.1 As the volume of fertilizer increases, the height/growth rate of plants increases (Any Suitable) 3.2 Heading Label X – Y units scale best-fit (- 2 for axes the wrong way round) 3.3 100ml 3.4 Same type of plant, same starting height, fertilizer added at the same time every day, plants grown in the same area, same pots (ANY 3) 3.5 Fertilizer promotes plant growth to a certain level, thereafter it has a negative effect.

  3. Question 4 4.1 Clean slide and cover slip Place sample in the centre of the slide Use sufficient water Lower the coverslip gently, from a 45 degree angle Mop up excess water (ANY 4) 4.2 Step 2: Slide is placed on the stage Step 3: Stage clips hold slide in place Step 4: Stage is lowered Step 5: Slide is viewed through the ocular Step 6: Coarse adjustment used to focus Step 7: Point to section you are interested in and move to a higher power

  4. 4.3 Irregular shape, no cell wall, no chloroplasts, small vacuoles (ANY 3) 4.4 Contains all genetic information, controls cell functions 4.5 Ectoplasm – Cytoplasm on the outside of the cell Endoplasm – Cytoplasm on the inside of the cell (Cytoplasm) 4.6 To help the amoeba move, or catch food, or fight germs Question 5 5.1 To harness light energy and make simple sugars 5.2 5 or 6 or 7 5.3 When the vacuole is full of water, cell contents are pushed out against the cell wall which pushes back 5.4 Labels – nucleus, cell membrane, cytoplasm Heading, accuracy, no sketching, no shading, large enough (-1 extra labels, -2 proper drawings!)

  5. Question 6 6.1 Hydrogen 6.2 Place a lit match at the mouth of the test tube. If it pops and extinguishes then the gas is Hydrogen 6.3 The magnesium metal will completely disintergrate 6.4 Magnesium + Hydrochloric acid => Magnesium Chloride + Hydrogen Question 7 7.1 7.5 7.2 6.5 7.3 As acidity levels increase the various species of fish are negatively affected, reduce species and/or extinction 7.4 Vinegar, tomatoes, lemon juice, carrot juice (ANY 3) 7.5 They are all acidic and they will neutralise the base 7.6 Blue

  6. Question 8 8.1 Title implies the sun provides us with food. It provides us with Vit D which assists in the absorption of Calcium 8.2 Vitamin D makes a calcium – binding protein which aids in the absorption of calcium. 8.3 Rickets 8.4 Development of bone tissue 8.5 Milk, cheese, yoghurt, almonds, broccoli, kale (any 2) 8.6 Weight bearing exercise 8.7 Small Intestine. Question 9 9.1 A- Liver B- Gall bladder C- Colon/ Large intestine D- rectum E- Oesophagus F- Stomach G – Small intesine 9.2 Enzymes are mixed with the food and breaks it down 9.3 F, G or B or Mouth

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