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ii Chapter 1 Cells and Their Structures 1 Chapter 2 Air, Our Body Systems and the Plant 8 Transport System Chapter 3 Reproduction 16 Chapter 4 Energy and Photosynthesis 25 Term Test 1 31 Chapter 5 Electricity 41 Chapter 6 Simple Machines 50 Chapter 7 Water and Its Changes of State 55 Chapter 8 Changes in the Environment 61 Term Test 2 69 Contents ©Praxis Publishing Singapore Pte. Ltd.
1 Chapter 1 Cells and Their Structures Chapter 1 1.1 Cells 1 Classify the organisms below into groups of unicellular and multicellular organisms. Cells and Their Structures Unicellular organism Multicellular organism Paramecium Ameba Mushroom Worm Fern Sea anemone Yeast Starfi sh Euglena ©Praxis Publishing Singapore Pte. Ltd.
3 Chapter 1 Cells and Their Structures (h) What is the function of 3(b)? (i) What is the function of 3(e)? (j) What is the function of 3(g)? 1.3 Cell Division 4 Draw the complete cell divisions below. (a) (b) (c) ©Praxis Publishing Singapore Pte. Ltd.
4 Primary 5 Hands-on Science 1 Which of the following statements is not true about cells? A A cell is the basic unit of life. B Cells are the building blocks of all living and non-living things. C Cells come in different shapes and sizes. D A cell is the smallest part of a living thing. 2 The diagram shows an organism X. X Which of the following organisms are in the same group as X ? I Paramecium II Yeast III Larva IV Tadpole A I and II B II and III C II, III and IV D I, II, III and IV 3 Which of the following is not found in an animal cell? A Cell membrane B Nucleus C Chloroplast D Cytoplasm 4 Y is found in a plant cell. The statements below defi ne Y. • It contains cell sap to keep the cell fi rm. • It provides support to the cells. What is Y ? A Nucleus B Cytoplasm C Cell membrane D Vacuole 5 Which is the main function of the cell membrane? A To support and protect the cell B To control what goes in and out of the cell C To make food for the plant D To control all the activities in the cell Objective Questions Choose the best answer. ©Praxis Publishing Singapore Pte. Ltd.
8 Primary 5 Hands-on Science Chapter 2 2.1 Air 2.2 Respiratory System 1 The diagram below shows the percentage of gases in the air. Label the correct types of gases according to their percentage. 2 The diagram shows the organs involved in the human respiratory system. Label the respiratory organs correctly and fi ll in the blanks with the function of the organ. (a) (b) (c) Air, Our Body Systems and the Plant Transport System GAS PERCENTAGE 78% 21% 1% (c) (a) (b) ©Praxis Publishing Singapore Pte. Ltd.
9 Chapter 2 Air, Our Body Systems and the Plant Transport System 3 Label the animals with their respiratory organs correctly. a f b g c h d i e j Skin Lungs Gills Openings in the body Lungs and skin ©Praxis Publishing Singapore Pte. Ltd.
16 Primary 5 Hands-on Science Chapter 3 3.1 Reproduction in Humans 1 (a) What is reproduction? (b) Why do living things need to reproduce? 2 (a) Label the parts of the male reproductive system. (iv (v) (ii) (iii) (i) (iv) (v) (b) What is the main reproductive organ for males? (c) What cells are produced by the testes during puberty? (d) List three changes in physical appearance during puberty in males. (i) (ii) (iii) Reproduction ©Praxis Publishing Singapore Pte. Ltd.
18 Primary 5 Hands-on Science 3.2 Reproduction in Animals 5 Name the type of fertilization in the animals below, whether internal fertilization or external fertilization. a e b f c g d h ©Praxis Publishing Singapore Pte. Ltd.
19 Chapter 3 Reproduction 3.3 Reproduction in Plants 6 The diagram below shows the parts of a fl ower. (a) Label all the parts of the fl ower. (iv) (v) (vi) (ii) (iii) (i) (iv) (v) (vi) (b) What is the function of 6(a)(i)? (c) What is the function of 6(a)(iii)? (d) What is the function of 6(a)(iv)? (e) What is pollination? (f) Give three examples of pollinating agents. ©Praxis Publishing Singapore Pte. Ltd.
25 Chapter 4 Energy and Photosynthesis Chapter 4 4.1 Energy from Food 1 The diagram below shows foods from different food groups. (a) What is the importance of food? (b) List three food groups and examples of each based on the diagram above. (i) (ii) (iii) (c) Explain how the energy from food is used to carry out the life processes below. (i) Digestion : (ii) Respiration : (iii) Growth : (iv) Movement : Energy and Photosynthesis ©Praxis Publishing Singapore Pte. Ltd.
27 Chapter 4 Energy and Photosynthesis 1 Why do humans need energy? I To walk II To eat III To sleep IV To breathe A I and II B I and III C II, III and IV D I, II, III and IV 2 What is the original source of almost all the energy in the environment? A Carbohydrates B Sunlight C Water D Carbon dioxide 3 How is energy used in the blood circulation process? I To carry blood containing waste materials away II To break down the food that was eaten III To carry blood that contains nutrients, water and oxygen to the whole body IV To help in repairing cells A I and II C II and III B I and III D III and IV 4 The statements below explain what happens in a fi eld. • The grass is eaten by a grasshopper. • The grass uses the sunlight to make its food. • The bird is eaten by an eagle. • The grasshopper is eaten by a bird. From the statements above, which is the correct fl ow on how the energy is passed on? A Grass o Grasshopper oBird oEagle oSun B Sun oGrass oGrasshopper oBird oEagle C Eagle oBird oGrasshopper oGrass oSun D Grass oSun oGrasshopper Bird oEagle 5 What is photosynthesis? A A process of making food for plants. B A process of absorbing sunlight to get energy supply. Choose the best answer. Objective Questions ©Praxis Publishing Singapore Pte. Ltd.
Term Test 1 31 7HUP7HVW MARKS Section A (60 marks) Each question is followed by four options, A, B, C and D. Choose the best answer. 1 The statements below describe an organism. • Made up of only one cell • Can be found in water • Some live in or on other organisms Which of the following organisms is not in the same group as the organism described above? A Euglena B Ameba C Ovum D Paramecium 2 The diagram shows four types of cells. Which one is a unicellular organism? A C B D 3 The diagram below shows a microscope. A B C D Which part of the microscope needs to be adjusted to get a sharp and clear image? 4 The diagram below shows an animal cell. What is the function of structure X ? A Provides support to the cell B Controls all activities in the cell C Controls things that enter and exit the cell D Maintains the shape of the cell ©Praxis Publishing Singapore Pte. Ltd.
32 Primary 5 Hands-on Science 5. The diagram below shows a plant cell. P Q S R Which structure contains the green pigment that is responsible for making food for the plant? A P B Q C R D S 6 The statements below show the functions of structures in the plant cell. X – It contains cell sap to keep the cell fi rm. Y – It is the place where all the activities take place. Z – It helps to maintain the shape of the cell. Which of the following is correct about X, Y and Z ? XYZ A Vacuole Cell wall Cytoplasm B Cytoplasm Cell wall Vacuole C Cell wall Vacuole Cytoplasm D Vacuole Cytoplasm Cell wall 7 Which of the following correctly shows the difference between an animal cell and a plant cell? Animal cell Plant cell A Has chloroplast No chloroplast B Has cytoplasm No cytoplasm C No cell wall Has cell wall D No nucleus Has a nucleus 8 The diagram below shows a paramecium. How does the paramecium grow? A Through reproduction B Through cell division C Through photosynthesis D Through respiration 9 What are the parts involved in the human breathing system? A Nose, windpipe, heart B Nose, lungs, skin C Nose, windpipe, lungs D Nose, windpipe, skin ©Praxis Publishing Singapore Pte. Ltd.
41 Chapter 5 Electricity Chapter 5 5.1 Electric Circuits 1 (a) Name the components of the circuit below. (iv) (iii) (ii) (i) (b) What is an electric current? (c) What is the function of your answer in 1(a)(i)? (d) What is the function of your answer in 1(a)(ii)? (e) What is the component of your answer in 1(a)(iii) that gives light when electricity passes through it ? (f) What is your answer in 1(a)(iv) made of? Electricity ©Praxis Publishing Singapore Pte. Ltd.
44 Primary 5 Hands-on Science 5.4 Electrical Conductors and Insulators 4 (a) What are electrical conductors? (b) What are electrical insulators? (c) The diagram below shows an electric circuit. Bulb Rod P (i) What will happen if rod P is made of iron? (ii) Suggest a material to replace rod P in order to turn off the bulb. (d) Tick () the correct ways to use electricity and cross out () the dangerous ways. (i) (ii) (iii) (iv) (v) ©Praxis Publishing Singapore Pte. Ltd.
45 Chapter 5 Electricity 1 The diagram below shows a complete electric circuit. + Battery Bulb Switch Connecting wire How many components are used to build a complete electric circuit? A 1 C 3 B 2 D 4 2 Which of the following is used to break and complete a circuit? A B C D 3 Which of the following is a closed circuit? A BATTERY AA C BATTERY AA B BATTERY AA D BATTERY AA 4 The diagram below shows two electric circuits. P + Q + Which of the following statements is true about the electric circuits? A Electric circuit P is a complete electric circuit. B The battery in electric circuit Q is stronger than that in P. C The bulb in electric circuit P is burnt. D The electric circuit Q is a complete circuit that allows electric current to fl ow through it. 5 Anna fi nds that the bulb she used in her experiment is dim. What should she do to make the bulb brighter? Choose the best answer. Objective Questions ©Praxis Publishing Singapore Pte. Ltd.
50 Primary 5 Hands-on Science 6.1 Types of Simple Machines Chapter 6 1 Name the type of simple machine for each of the following examples. Simple Machines (a) (e) (b) (f) (c) (g) (d) (h) ©Praxis Publishing Singapore Pte. Ltd.
51 Chapter 6 Simple Machines 2 Match the simple machines below with their functions. 3 Tick () for the correct ways in handling simple machines and cross () for the incorrect ways. (i) To lift up objects to a higher level of a building (ii) To carry bricks using a wheelbarrow (iii) To fasten wood panels of a cupboard (iv) To chop wood using an axe (v) To ease the movement of a trolley full of goods when pushing it over a great distance (vi) To load goods into a truck (vii) To control the speed of a bicycle when cycling (a) Lever (b) Pulley (c) Gear (d) Wheel and axle (e) Inclined plane (f) Screw (g) Wedge 6.2 Precautionary Measures in Using Simple Machines (a) Check the ladder if it is sturdy or not before using it. (b) Use a dull blade when playing with friends. (c) Store tools such as pliers and screwdrivers in a toolbox. (d) Use a new handsaw without checking if the handle is fi xed securely to the blade. (e) Check if the rope is in good condition before using the pulley. ©Praxis Publishing Singapore Pte. Ltd.
52 Primary 5 Hands-on Science 1 Which of the following is a lever? A B C D 2 The diagram below shows a type of lever. What are J, K and L? JKL A Effort Load Fulcrum B Load Fulcrum Effort C Fulcrum Load Effort D Fulcrum Effort Load 3 The diagram below shows an example of a lever. Which of the following is in the same class of the lever in the diagram? A C B D 4 The diagram below shows a pupil raising a fl ag. What is the simple machine used to raise the fl ag? A Gear B Lever C Pulley D Wheel and axle Choose the best answer. Objective Questions ©Praxis Publishing Singapore Pte. Ltd.
55 Chapter 7 Water and Its Changes of State Chapter 7 7.1 Changes of State in Water 7.2 The Water Cycle 1 Based on the diagrams below, complete the table with the example given. 2 Fill in the blanks with the correct answers. Water and Its Changes of State Water vapor River Pond Cloud Sea Change of state Process Loses heat / Gains heat Q o P Liquid o Solid Freezing Loses heat (a) P o Q (b) Q o R (c) S o U (d) U o T S U T Q P R The clouds become heavy and the water droplets fall to the Earth as . The fl ows to river, ponds, seas and other places where the cycle repeats itself. The water from the seas, rivers and ponds evaporates by the heat from the Sun through the process of . d a Water vapor cools and condenses into tiny water droplets through the process of . The clouds form. b c ©Praxis Publishing Singapore Pte. Ltd.
60 Primary 5 Hands-on Science 2 The diagram below shows the water cycle. Process X Process Y (a) Name the processes. (i) X : (ii) Y : (b) Why is process Y important in the natural water cycle? (c) How are the clouds formed? (d) If the surrounding temperature increases, which processes will become effective? (e) State one importance of water. (f) State one consequence if our natural water resources are polluted. ©Praxis Publishing Singapore Pte. Ltd.
61 Chapter 8 Changes in the Environment Chapter 8 8.1 Soil 8.2 Rocks 1 Answer all the questions below. (a) Name three types of soil. (b) Which type of soil allows water to fl ow through it easily? (c) Which type of soil contains a lot of organic materials? (d) State the most suitable soil used to plant the following plants. (i) Cactus: (ii) Paddy: (e) Name three types of weathering processes in soil formation. 2 Tick () the correct statements and cross out () the incorrect statements. (a) Igneous rocks are formed when magma cools and solidifi es. ( ) (b) Limestone is an example of sedimentary rock. ( ) (c) Igneous rocks usually contain a lot of fossils. ( ) (d) Metamorphic rocks are formed due to great pressure and heat. ( ) (e) Rocks can be divided into three main groups which are igneous, ( ) sedimentary and metamorphic rocks. Changes in the Environment ©Praxis Publishing Singapore Pte. Ltd.
68 Primary 5 Hands-on Science 3 The diagram below shows a picture of a natural disaster. (a) What is the natural disaster called? (b) What are the causes of this natural disaster? (c) What are the safety precautions taken if the natural disaster is predicted? (d) What are the effects of this natural disaster? (e) Apart from natural disasters, human activities can change the surface of Earth. Give three human activities that change the surface of Earth and benefi t humans. ©Praxis Publishing Singapore Pte. Ltd.
Term Test 2 69 7HUP7HVW MARKS Section A (60 marks) Each question is followed by four options, A, B, C and D. Choose the best answer. 1 Which of the following are unicellular organisms? I Chlorophyll II Euglena III Yeast IV Ameba A I and II B I and III C I, II and III D II, III and IV 2 Which of the following is not found in animal cells? A Nucleus B Vacuole C Cell wall D Cytoplasm 3 What is the process that takes place to replace damaged cheek cells? A Reproduction B Cell division C Fertilization D Pollination 4 The diagram below shows an animal that lives in the ocean. Which of the following animals has the same respiratory organ as the animal shown? A C B D 5 The information below shows the respiratory organs of two groups of animals. J – Moist skin K – Openings in the body Which of the following pairs represents J and K ? J K A Cockroach Snail B Earthworm Tortoise C Snail Caterpillar D Snake Ant ©Praxis Publishing Singapore Pte. Ltd.
Term Test 2 77 (b) Explain your answers in 5(a). (1 mark) (c) What conclusion can you make from this investigation? (1 mark) 6 The diagram below shows a situation at the construction area. K (a) Name the simple machine K. (1 mark) (b) How does K help the worker to transfer the bricks? (1 mark) (c) Name one other example of K. (1 mark) (d) Name two types of simple machines in a wheelbarrow. (2 marks) ©Praxis Publishing Singapore Pte. Ltd.