This paper will consist of questions from Biology, Chemistry and Physics. Time allowed 1 hour.

Transcription

1 TRURO SCHOOL 13+ SCIENCE SAMPLE This paper will consist of questions from Biology, Chemistry and Physics Time allowed 1 hour. When told to do so, please turn over to commence the Biology section and then continue through the paper. Page 1 of 17

2 Q1. The diagram shows a plant cell. (a) (i) The cell is from a leaf. Give the name of the part which is present in this leaf not present in root cells (ii) Give two parts, labelled on the diagram, which are not present in animal cells. 2 marks (b) The five parts of the cell labelled on the diagram have different functions. In the table below, write the name of the correct part of the cell next to its function. One has been done for you 4 marks Page 2 of 17

3 Q2. The graph below shows how a population of fish in a lake changed over a period of time a) In which time interval, A, B, C, D or E, did the population of fish increase most quickly?... How can you tell this from the graph? (b) Which part of the graph shows when the fish begin to compete with each other for food? Give the letter.... How can you tell this from the graph? (c) What does part D of the graph show about the birth rate and the death rate of the fish? How can you tell this from the graph? Page 3 of 17

4 (d) Part E of the graph shows a population crash when all the fish died. Suggest two reasons why a population might crash in this way Q3. (a) Diagram 1 is a simplified drawing of bones and muscles in a left leg viewed from the outer side. (i) Muscle A contracts. What effect does this have on the leg? (ii) Muscles are found in antagonistic pairs. Write the letters of the pair of muscles which control the bending and straightening of the leg at the knee.... (iii) When one muscle of an antagonistic pair contracts the other muscle does not relax completely, but maintains some tension. What is the advantage of maintaining tension in both muscles Page 4 of 17

5 (b) Diagram 2 shows the elbow joint. Tissue X covers the ends of the bones at the joint. (i) (ii) Give the name of tissue X.. Osteoarthritis is a very painful condition. In the joints of people with osteoarthritis small pieces of tissue X break off. Suggest two effects this could have on the joint. 2 marks (c) (i) Tendons are shown in diagram 1 and ligaments are shown in diagram 2. Ligaments can stretch much more than tendons. Explain why ligaments at the elbow need to stretch (ii) Explain why it is necessary that tendons hardly stretch at all when a muscle contracts Page 5 of 17

6 Chemistry (1) Complete the following word equations. If there is no reaction, write no reaction. (a) Iron (III) Oxide + Zinc (b) Zinc + Copper oxide (c) Copper + Lead sulfate (d) Copper oxide + Carbon (e) Magnesium + Calcium oxide (f) Tin + Silver chloride (6 marks) (2) Look at the following reaction: Tin Oxide + carbon Tin + Carbon-dioxide (a) Put a circle around the oxidising agent. () (b) Put a square around the substance that has been oxidised. () (c) The symbol equation for this reaction is not balanced. Please balance this equation so that there are the same number of atoms on each side of the arrow. (2 marks) SnO + C Sn + CO 2 (3) When red iron oxide powder and black carbon powder are heated together, the powders glow and give off a gas. Once cooled, a grey powder remains. Explain what is occurring in this process & write a word equation for the process. (4 marks) Page 6 of 17

7 (4) The following equations represent reactions which were carried out to find out how chromium fitted into the Reactivity Series: 1) copper + tin oxide no reaction 2) iron + chromium oxide iron oxide + chromium 3) chromium + tin oxide chromium oxide + tin List the metals in order of reactivity, placing the most reactive one first. 1)...2)...3)...4)... (4 marks) (5) Explain how you could extract Silver Metal from a solution of Silver Nitrate using Copper Wire. Write a word equation to help with your description. (4 marks) (6) Iron can be extracted in industry using a Blast Furnace. This uses carbon in the form of coke to react with Iron (III) Oxide under very hot temperatures. In the furnace, three reactions occur: a) carbon reacts with oxygen to make carbon dioxide b) carbon reacts with carbon-dioxide to make carbon-monoxide c) carbon monoxide reacts with iron (III) oxide to make Iron and carbon-dioxide. The symbols for these things are as follows: Carbon = C; Oxygen = O 2; Carbon-dioxide = CO 2; Carbonmonoxide = CO and iron (III) oxide = Fe 2O 3 Write a BALANCED symbol equation for reaction a) Write a BALANCED symbol equation for reaction b) Page 7 of 17

8 This is an unbalanced symbol equation for reaction c): Fe 2O 3 + CO Fe + CO 2 Balance it so that there are the same number of atoms on each side. (6 marks) (7) Salts can be made in three different ways. A student would like to make sodium chloride salt. The first has been done for you. Write down two other word equations that would result in sodium chloride salt being formed: a) SODIUM + HYDROCHLORIC ACID SODIUM CHLORIDE + HYDROGEN.. b) c) (6 marks) (8) Why would it not be a good idea to use method a) in the lab to produce a sample of sodium chloride salt? () Page 8 of 17

9 Physics 1. (i) What apparatus would you use to find the mass of an object? (ii) Remembering that density = mass / volume. The mass of 150cm 3 of water is 150g, what is the density of water? (iii) Ice floats on water. What does this fact tell you about the density of ice? (iv) A block of iron measures 20cm by 20cm by 10cm. The block has a mass of 32000g. What is the density of iron in g/cm 3? 2. Which of the following is not a terrestrial planet? A Mars B Earth C Uranus D Venus 3. How long is a lunar month? A 29 days B 60 days C 24 hours D 7 days 4. The Earth axis of rotation is at an angle of 23 0 to the vertical. As a result, the following phenomena is produced: A tides B seasons C leap year D lunar eclipse 5. The tides on Earth are produced due to the A wind C the gravity of the Moon B spin of the Earth D the gravity of the Sun and the Moon Page 9 of 17

10 Page 10 of This ball of plasticine is weighed first in air, then in water. (i) What happens to the weight reading on the force meter when the plasticine is weighed in water? (ii) If released in water, the ball of plasticine sinks. Use forces to explain why. 7. Where has most of the energy in the world come from? 8. The picture shows the apparatus and the circuit diagram of the circuit that you might have used when investigating the conduction of electricity. (a) Which of the following materials would conduct electricity so that the bulb comes on: (ring the materials) copper wood paper plastic rubber graphite

11 Page 11 of 17 (b) What could you do to the circuit to make the bulb: (i) dimmer... (ii) brighter... 9 Solids are better conductors than liquids or gases because: A B C D the particles are closer together in gases. the particles are closer together in liquids. the particles are closer together in solids. the particles in a solid cannot move. 10 Feathers are good insulators because: A B C D they are solid. birds have them. they trap pockets of air. they are waterproof. THE END Please use any time you have left to check through your work