james ang's really useful psle science word-list
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James Ang's Really Useful PSLE Science Word-listWritten by James Ang on July 30 2005 at 10:55AM
A list of really useful science words for PSLE students.
James Ang's Really Useful PSLE Science Word-list
No. Words Meaning RelatedWords
1 Absorber A material that takes in water or other things suchas energy and radiation.
2 Acid A chemical with a sour taste which turns blue litmuspaper red.
3 Adaptation Animals and plants survive in nature due to theirspecial characteristics and natural protectivemechanisms.
4 Alkali A chemical with a bitter taste which turns red litmuspaper blue.
5 Alloy A material usually made from the mixtures of two ormore metals.
6 Amoeba A unicellular micro-organism that can carry out itsown life functions.
7 Amphibian An amphibian is an animal that can live in both landand water. An example is the frog.
8 Anther The male part of a flower which produces pollengrains.
Stigma
9 Antiseptic Substance that kills germs that may be found in cutsand wounds.
10 Artery A blood vessel that carries blood rich in oxygenaway from the heart to the other parts of the body.
Vein;capillaries
11 Atmosphere The air that surrounds planet Earth.
12 Atom The smallest particle in an element. Each atom hasa nucleus in the middle and one or more electronsorbiting around it.
13 Axis The axis of the Earth is an imaginary line through theEarth from North to South pole which causes dayand night when the Earth rotates around its axis
14 Bacteria Tiny organisms which are made up of one cell, manywhich cause diseases.
Bacterium(Singular)
15 Ball and socket joint A type of connection between two bones that allowsrotational movement. An example is the neck joint.
16 Biodegradable Biodegradable materials can be broken downnaturally by decomposers such as bacteria or fungi.
17 Biotechnology The study of living things to produce benefits toensure the survival of the human species.
Life science
18 Bladder An organ in the abdomen which stores urine before itis released outside of the body.
19 Blood Blood is the red liquid that is pumped around ourbody by the heart. It transports oxygen, food, waterto all parts of our body.
20 Boiling point The temperature at which a liquid changes to a gas.
21 Budding A method of reproduction in which a new cell isformed by growing out from a part of the parent cell.Micro-organisms such as yeast reproduced bybudding.
22 Camouflage Protection mechanisms due to the colour, markingor animal shape that help living things to blend withits surroundings.
23 Capillaries Capillaries are narrow blood vessels that connectarteries to veins in order for substances to betransported to and away from the body cells.
Capillary(singular)
24 Carbohydrates Carbohydrates are foods that give us energy. Starch
25 Carbon cycle The process by which carbon in the atmosphere isconverted from one form to another and back again ina continuous manner.
26 Carbon dioxide A colourless and odourless gas which makes up0.03% of air. It can trap heat and cause greenhouseeffect. It is taken in by green plants duringphotosynthesis and given out by living things duringrespiration and given off during decomposition.
Greenhouseeffect
27 Carnivore An animal that only feeds on other animals
27 Carnivore An animal that only feeds on other animals
28 Catalyst A catalyst speeds up the rate of a reaction withoutitself being changed in the process.
29 Cell The smallest unit of life. All living things are made upof cells.
30 Cell division The process whereby one cell splits to produce twonew, identical cells.
31 Cell membrane The thin and soft layer that surrounds the cytoplasmof a cell which controls the materials moving into andout of the cell. It is semi-permeable in that it allowssome substances to pass through but not others.
32 Cell sap The liquid found in a plant cell which keeps the cellfirm.
33 Cell wall A thick layer around the plant cell that is made up ofcellulose and helps maintain the shape of the plantcell.
34 Centre of gravity The point at which the mass of an object appears toact on.
35 Ceramic A hard and strong material which is made from sandor clay.
36 Characteristics Properties or qualities used to describe ordistinguish a thing or group of things.
37 Chemical change A change which had taken place which cannot bechanged back to it original form without employingthe use of chemical means. Example is the burningof paper.
Irreversiblechange
38 Chemical energy A form of energy that is stored in chemical formswaiting to be used. Examples are candles, food andbatteries.
39 Chlorophyll The green pigment found in plants that enablesphotosynthesis to take place.
Chloroplasts
40 Chloroplasts Tiny discs found in plant cells containing chlorophyll.
41 Chromosome Thread like structures that have genes and controlwhat a living thing looks like and how it functions.
42 Circuit The path though which electricity flows from thebattery through wires and devices before returning
back to the power source.
43 Circuit breaker A device that automatically breaks the flow ofelectricity in a circuit when there is a surge ofelectric current caused by faulty appliances or shortcircuit.
44 Circulatory system It is made up of the heart, blood vessels and blood tocarry food, water, oxygen and waste materials withinthe body.
45 Classification A system of organising and arranging things that arerelated and/or share similar characteristics or nature.Helps to make the information more useful and easyto understand and remember.
Dichotomouskey
46 Closed circuit A closed circuit allows electricity to flow through.
47 Combustion The burning through the action of heat on certainmaterials.
48 Community It is made up of all the populations of living thingsthat lives together in a habitat.
49 Condensation The process in which a gas changes to a liquid uponcooling.
Evaporation
50 Conduction A method of heat or electricity transfer which usuallytakes place in a solid object.
51 Conductor A material that allows heat or electricity to passthrough it easily. Most metals such as copper andsilver are good conductors.
Insulator
52 Conservation Protection and preservation of the environment andnatural resources.
53 Constriction A small bend found in the clinical thermometer toprevent the mercury from flowing back to the bulb.
54 Consumer An animal that eats plants or other animals to deriveenergy.
55 Contraction A decrease in size or volume due to heat loss. Expansion
56 Control experiment An experiment that is set up to be use forcomparison to identify the effect or observation madedue to a change of a condition or variable in theexperiment.
57 Convection A method of heat transfer that usually occurs in
57 Convection A method of heat transfer that usually occurs ingases or liquids.
58 Criteria The valid and necessary conditions. Criterion(singular)
59 Current A flow of electricity in a circuit. Current is measuredin Amperes.
60 Cytoplasm Jelly-like substance containing chemicals wherechemical reactions of the cell take place.
61 Decomposer An organism that breaks down dead or decayingmaterials into simple forms. Carbon dioxide isproduced in the process. Examples are bacteria andfungi.
62 Definition A statement of the meaning of a word, word group ora process.
63 Deforestation The indiscriminate cutting down or burning of treesfor mankind related development.
64 Density A measure of the mass of an object per unit volume.Materials with a high density are heavy for their sizewhile materials with a low density are light for theirsize.
65 DeoxyribonucleicAcid (DNA)
The molecules of DNA contain the information forcells to reproduce correctly.
66 Diaphragm A dome-shaped sheet of muscle that supports andseparates the chest from the abdomen.
67 Dichotomous key A classification used to identify living things bydividing the group into two smaller groups each time.
68 Digestion The process by which food is broken down intosimpler forms for adsorption into the blood stream tobe transported to the other parts of the body.
Enzyme
69 Dispersal The scattering of fruits and seeds for reproduction ofplants to take place in a favourable environment.
70 Diversity The variety of living and non-living things that havedifferent characteristics.
71 Dynamo A device that converts kinetic energy to generateelectricity to power appliances and households.
Generator
72 Ecosystem The living environment of a community of organisms.
73 Efficiency The ratio of the Output energy over the Input energy.
74 Effort The amount of force to be exerted on the body.
75 Elastic energy A form of potential energy stored due to thecompression or stretching of an elastic material.
76 Electrical energy A form of energy caused by the flow of electronsthrough an electrical conductor.
77 Electricity The flow of electrical energy through an electricalconductor.
78 Electromagnet A magnet that is made by passing an electriccurrent though a solenoid (a wire coil) around a pieceof soft iron core.
Solenoid;permanent
magnet
79 Electron A negatively charged particle found inside an atomand which orbit around the nucleus.
80 Element An element is a substance that cannot be brokendown into simpler substances by any chemicalmethod.
Atom
81 Embryo An unborn offspring of an animal that is formed insidethe animal or an egg.
82 Energy Energy is the capacity to do work.
83 Environment The living and non-living things that affect theorganism in its habitat.
84 Enzyme Enzymes are organic catalysts which speed up therate of reactions. Examples are digestive enzymessuch as amylase and protease.
85 Evaporation The process in which a liquid changes to a gas orvapour. The rate of evaporation depends on humidity,wind, temperature and the size of exposed surfacearea.
Condensation
86 Exhale To give or breathe out air.
87 Expansion An increase in size or volume due to heat gain contraction
88 Experiment A scientific method use to test out an idea ordemonstrate the effect of an action.
89 Extinct The state of being no longer in existence.
90 Fats Fats found in animals are reserves for when food is
90 Fats Fats found in animals are reserves for when food isscarce. Fats are solids while oil is liquid.
91 Fermentation A process where sugar or carbohydrates arechanged into alcohol and carbon dioxide due to theaction of yeast which is a fungus. Fermentation isused in the making of bread and the production ofbeer and wine.
92 Fertilisation The process in which the male cell meets the femalecell and fuses together.
Reproduction
93 Filament The filament is a male part of the flower which holdsup the anther.
94 Filter A technique of separating a soluble substance froma insoluble substance by means of a filter paper.
95 Filtrate The clear part of substance that has passed throughthe filter paper.
96 Flexibility The ability of a material to be bent easily withoutbreaking or damaging it. An example of a flexiblematerial is rubber.
97 Food chain A food chain shows the food relationship and thetransfer of energy among organisms.
98 Food pyramid A food pyramid shows food relationship, size ofpopulations and relative amount of food eachconsumer needs for survival.
99 Food web A food web is made up of a series of food chains thatare interconnected.
100 Force A push or a pull. It can affect the motion and alsochange the shape of an object.
101 Freezing point The temperature at which a liquid changes to a solid.
102 Frequency The number of complete cycles per unit time.
103 Friction A rubbing force which slows down moving objects.
104 Fuel Anything that produces heat and light energy whenburnt.
105 Fulcrum The point at which a lever is supported. Also knownas a pivot, hinge or knife edge.
106 Full moon The moon with the whole disk illuminated by the
106 Full moon The moon with the whole disk illuminated by theSun.
107 Fungi A group of non-green living things that reproduce byspores and cannot make its own food. They live onother living things and organic materials such assawdust for their nutrition. Examples aremushrooms, yeast and mould.
Fungus(singular);
sk ininfections
108 Gear A wheel which has toothed edges and can be usedto transfer motion.
109 Gene A part of a chromosome which controls thecharacteristics in an organism.
110 Genetic engineering Techniques used in the alteration (by adding orremoval) of an organism's genetic make-up.
111 Genetic selection The selection of desirable gene for massreproduction.
112 Germination The initial growth of a seed or spore in a conduciveenvironment.
113 Global warming An increase in the Earth's atmospheric temperaturedue to ecological changes.
Greenhouseeffect
114 Glucose A form of simple sugar that is carried in the bloodstream and used during respiration to produceenergy to do work and keep the body warm.
115 Gravitation potentialenergy
Energy stored in a body as a result of its positiondue to height. Magnitude of gravitational potentialenergy depends on the mass, gravitationalacceleration and height.
116 Gravity Force of attraction that pulls all objects towards theEarth.
117 Greenhouse effect Atmospheric gases such as carbon dioxide trap heatand cause an overall global warming effect.
Globalwarming
118 Habitat The place or home of an organism.
119 Hardness The ability of a material to withstand scratches. Anexample is of a hard material is diamond which isthe hardest naturally occurring material.
120 Heat A form of energy that causes a change to thetemperature of an object and its surroundings. Heathas no mass and does not occupy space.
121 Herbivore An animal that only feeds on plants.
121 Herbivore An animal that only feeds on plants.
122 Hinge joint A type of connection between two bones that allowsforward and backward movement. An example is theelbow joint.
123 Homo sapiens The scientific name for mankind.
124 Humidity The "wetness" or the amount of water vapourcontained in the air.
125 Hydroelectric energy A form of electrical energy produced when water atgreat heights is used to move the generator turbines.
126 Hydrogen A colourless and odourless gas which is the lightestgas in the world. It is explosive when in contact witha naked flame.
127 Hypothesis An idea that is derived from observation but whichhas not been scientifically proven to be correct andvalid.
128 Inclined plane A surface that has been raised on one end.
129 Indicator An indicator is a substance which changes colourdepending on whether the solution to be tested isacidic or alkaline.
130 Infer To provide an explanation about or to derive aconclusion based on certain observations.
131 Inhale To take or breathe in air.
132 Inheritance Characteristics which are passed down from thegenes of the parents.
DNA
133 Insect An insect is an animal that has three parts to itsbody and also has six legs. An example is housefly.But a spider is not a insect because it has 8 legs.
134 Insulator A material that prevents heat or electricity to passthrough. Most non-metals such as air and plasticsare insulators.
135 Interdependent A relationship in which organisms depend on oneanother for survival.
136 Invertebrate Animal without backbone.
137 Iodine solution A solution used to test for the presence of starch.Turns from brown to blue in presence of starch.
138 Irreversible change A change which had taken place which cannot bechanged back to it original form without employingthe use of chemical means. Example is the burningof paper.
Chemicalchange
139 Kinetic energy A form of energy due to the motion of a body. Movementenergy
140 Laboratory The place where scientists conduct experiments tofurther the discovery of science. Chemicals andapparatus are found in a laboratory.
141 Large intestine The part of the digestive system that absorbs waterand mineral salts. This section is after the smallintestine and before the rectum.
142 Larva The young of an insect that has been hatched froman egg and which has a 4-stage life cycle. The larvadoes not resemble the adult.
Larvae(plural); pupa
143 Lever A simple machine which is made up of a strong rigidbar supported on a fulcrum.
144 Life cycle Natural stages of growth that an organism must passthrough from the time it is born or hatched until itdies.
145 Life science The study of living things to produce benefits toensure the survival of the human species.
Biotechnology
146 Light A form of energy we can detect with our eyes toallow us to see. White light can be split into aspectrum of colours. Light has no mass and doesnot occupy space.
147 Limewater A solution used to test for the presence of carbondioxide gas. Limewater turns milky (or chalky) whencarbon dioxide is passed through it.
148 Load The work that is to be done or carried out.
149 Luminous Being able to be seen by the naked eye.
150 Magnet An object that can exert a magnetic push or pull onother magnetic objects that are made of iron, steel,nickel or cobalt.
151 Magnetism An invisible force that acts on magnetic materialssuch as iron, steel, nickel and cobalt.
152 Magnitude The size and amount of a certain quantity.
153 Mammal An animal that has hair. The female gives birth to itsyoung and produces milk to feed them. Examplesare human beings, apes, whale and dolphin.
154 Mass The amount of matter in the object. Mass ismeasured in grams and kilograms.
155 Material Any matter such as glass, wood, ceramic andplastics from which things are made from.
Naturalmaterial;syntheticmaterial
156 Matter Any object that has weight and occupies space.
157 Maximum The biggest or highest amount of a quantity.
158 Melting point The temperature at which a solid changes to a liquid.
159 Membrane A thin and soft layer which allows some substancesto pass through it but not others.
160 Mercury A liquid metal commonly used in a clinicalthermometer. Also a name for a planet in the Solarsystem.
161 Micro-organism A tiny living thing that cannot normally be seen bythe naked human eye but can be observed under amicroscope. Examples are bacteria and germs.
Microscope
162 Microscope An instrument used to observe micro-organisms bymagnifying them.
163 Mineral salts Chemicals that occur naturally and a small amountis required for overall good health.
164 Minimum The smallest or lowest amount of a quantity.
165 Momentum The product of the mass and velocity of a movingobject.
166 Moon A natural satellite that revolves around Earth or anyother planets. The moon does not give off its ownlight but reflects the light it gets from the Sun.
167 Motion An act, process or instance of moving. Movement
168 Motor A device that converts chemical or electrical energyto kinetic energy.
Engine
169 Moult The shedding of skin by insects such as cockroachwhen they outgrow the skin.
when they outgrow the skin.
170 Movement energy A form of energy due to the motion of a body. Kinetic energy
171 Multicellular Organisms that are made of more than one cell arecalled multicellular organisms.
172 Muscle A thick, stretchy tissue that is attached to the bonesto control the body parts movements.
173 Muscular system It is made up of all the muscles in the body to enablemovement of various body parts to take place.
174 Natural material Materials that occur naturally such as rubber, wood,cotton.
175 Nerve A body tissue that transmit messages from one partof the body to another.
176 Neutron A particle found inside the nucleus of an atom andwhich does not carry any charge.
177 Nitrogen A colourless, odourless and inert (unreactive) gaswhich makes up 78% of air.
178 Nitrogen cycle The process by which nitrogen in the atmosphere isconverted from one form to another and back again ina continuous manner.
179 Non renewable Not replaceable. Take a long time to be replacednaturally. An example is crude oil.
180 Nuclear fusion The fusing or combining of two atoms to form a largerone.
181 Nuclear fission The splitting of an unstable atom into two or moresmaller particles. During the process enormousamount of energy is given off.
182 Nucleus A small structure which contains chromosomes andcontrols the chemical reactions of the cell.
183 Nutrients Substances that enable plant and animal growth.
184 Nutrition The process of taking in food to get energy and forgrowth and repair.
185 Nymph The young of an insect that has been hatched froman egg and which resembles the adult. An exampleis the cockroach.
186 Oesophagus (gullet) The part of the digestive system that passes foodfrom the mouth to the stomach.
187 Omnivore An animal that feeds on both plants and animals.
188 Opaque Does not allow any light to pass through it. One isunable to see through an opaque object. An exampleis cardboard.
transparent;translucent
189 Open circuit An open circuit does not allow electricity to passthrough.
190 Orbit The circular path through which an object movesaround another object in space.
satellite
191 Organ A group of tissues organised to perform a particularfunction. Examples are kidney, heart and thestomach
192 Organ system A group of organs organised to perform a particularfunction. Examples are digestive system, circulatorysystem.
193 Organisms All living things are organisms.
194 Ovary The female part of a plant or an animal whichcontains the ovules (plant) and the eggs (animal).
195 Ovule The female part of a plant which contains the eggcell or seed.
196 Oxygen A colourless and odourless gas which is required byall living things in order to stay alive. It makes up20% of air and supports combustion (burning).
Respiration
197 Ozone layer A layer of ozone found in the Earth's atmospherewhich protects the living things from harmfulultraviolet radiation of the Sun.
198 Parasite An organism that depends or lives on other livingorganisms for food and nutrition.
199 Perpendicular A line which forms a right angle with the original line.
200 Phloem The outer tube in a plant that transports food fromthe leaves to other parts of the plant.
Xylem
201 Photosynthesis The process by which green plants make food fromwater and carbon dioxide in the presence of light.Oxygen is produced during photosynthesis.
202 Physical change A change which had taken place which can be easilychanged back to its original form by the use ofphysical means. Example is the change in states ofwater.
Reversiblechange
203 Planet A large object that revolves around the Sun. The nineplanets in the Solar System are; Mercury, Venus,Earth, Mars, Jupiter, Saturn, Uranus, Neptune andPluto.
204 Plastic A man-made material which is cheap, durable andwaterproof and is derived from the refining ofpetroleum. It does not break down easily and cancause pollution. Recycling and reuse of plastics helpto reduce environmental pollution.
205 Pollen grains The male cells of a flower that is used to pollinatethe flower.
206 Pollination The movement of pollens from the anther of a flowerto reach the stigma so that reproduction can takeplace.
207 Pollution Actions and activities that causes the environment tobecome dirty and unsuitable for living.
208 Population A group of living things of the same kind livingtogether and reproducing themselves in a particularhabitat.
209 Potential energy A form of energy that is stored for the purpose ofbeing used later.
Stored energy
210 Predator An animal that hunts for other animals for food. Mostcarnivores are predators.
Prey
211 Predict To forecast or make a guess based on what isknown or observed.
212 Pressure Pressure is the force pressing on a given area.
213 Prey An animal that is eaten by other animals. Allherbivores are prey.
214 Primary colours Red, blue and green colours are primary colours.
215 Prism A prism is a shaped piece of glass which can splitwhite light into the colour of a spectrum or a rainbow.
216 Producer Green plants that can make their own food byphotosynthesis.
217 Protein Protein helps build the body's tissue for growth andrepair.
218 Proton A positively charged particle found inside the nucleusof an atom.
219 Puberty The stage in mankind where the reproductive organsare being developed.
220 Pulley A simple machine which is made up of a rope woundaround a supported wheel.
221 Pulse The rate of heart beats which can be felt in thearteries.
222 Pupa The stage of growth between the larva and the adultof an insect of a 4-stage life cycle.
Pupae (plural)
223 Radiation A method of heat transfer that does not required amedium for it to take place.
224 Rainbow A rainbow is a natural phenomenon and is formedwhen sunlight passes through drops of rain.
225 Rate A measure of quantity in relation to time.
226 Reaction When chemicals react they combine together indifferent ways or splits apart to form simplersubstances.
227 Recycle To be used again through a cycle of changes ortreatment. An example is plastics which can berecycled.
228 Reflection The process by which light and sound waves getbounced off when they strike a surface.
229 Reflector A material that causes light energy or other form ofradiation to bounce off a smooth surface.
230 Renewable Can be replaced naturally. An example of renewableresource is trees.
231 Reproduction The process by which living things produce more oftheir own kind to ensure the survival of the species.
232 Reptile Reptiles are cold blooded animals which have dryand scaly skins. An example is crocodile.
233 Residue The part remaining after another part has beenfiltered away by filtration method.
filtered away by filtration method.
234 Respiration The process by which living things take in oxygen tobreak down food to produce energy to do work andkeep the body warm. Carbon dioxide is given offduring respiration.
235 Respiratory system It is made up of nose, mouth, windpipe, lungs anddiaphragm working together to exchange gases withthe surroundings.
236 Retina The part of the eye which captures the image aperson sees.
237 Reversible change A change which had taken place which can be easilychanged back to its original form by the use ofphysical means. Example is the change in states ofwater.
Physicalchange
238 Revolution One revolution is a complete round of movementabout an object.
239 Ribcage The part of the skeleton that protects the lungs andheart.
240 Rotation The process of turning or spinning on its own axis ina circular motion.
241 Satellite An object that revolves around another object inspace.
orbit
242 Scavenger A scavenger does not hunt for its own prey but feedson dead animals left behind by other predators.
243 Science Science is the study or natural things around us.
244 Scientific method The way scientists go about finding out things.
245 Seed leaf The part of a seed that protects the baby plant andprovides it with food during germination stage.
246 Seedling A young plant made of few roots and leaves.
247 Semi permeablemembrane
A thin and soft layer which allows some substancesto pass through it but not others.
248 Shadow The darkened parts formed when light is blocked byan opaque object. Shadow has no mass and doesnot occupy space.
249 Skeletal system It is made up of all the bones in the body to supportthe body to give it a structure and to protect thedelicate body organs.
250 Skeleton The supporting framework of the body of mostanimals.
Vertebrate;invertebrate
251 Small intestine The part of the digestive system where most of thedigestion of food takes place. This section is afterthe stomach and before the large intestine.
252 Soil erosion The removal of top soil by wind or water and whichwill lead to environmental problems.
253 Solar energy A form of light and heat energy that comes from theSun.
254 Solar system The Solar System comprises the Sun. the planetsthat revolves around it and the moons.
255 Solution A mixture of a liquid with a dissolved solid or gas.
256 Sound A form of energy produced as a result of vibrationand which can be audible (heard) by living things.
257 Species A group of living things of the same kind that canreproduce to continue their existence.
258 Speed How fast an object moves. That is the rate of changeof distance moved.
259 Sperm A male reproductive cell that that is produced by thetestis of the male animal.
260 Spore Produced by fungi, ferns, moss and bacteria forreproduction.
261 Star An object in space which gives off its own light andheat. The Sun is the most important star in the Solarsystem.
262 Starch Starch is food that gives us energy. Examples arebread, pasta and potatoes which contain starch.
Carbohydrates
263 Steam Water vapour form from boiling of water at 100degrees Celsius.
264 Stigma The female part of a flower which receives the pollengrains.
265 Stomata Tiny openings on the surface of a leaf which allowexchange of gases and water vapour. Stomata are
Stoma(singular)
exchange of gases and water vapour. Stomata arefound mostly on the underside of the leaf.
(singular)
266 Stored energy A form of energy that is stored for the purpose ofbeing used later.
Potentialenergy
267 Streamline A shape or form which allows air and water to slipthrough easily.
268 Strength The amount of force which can be applied to amaterial without breaking it. Example of a strongmaterial is iron or steel.
269 Style The style is a female part of a flower which connectsthe stigma and the ovary.
270 Sundial A olden day instrument used to tell the time of theday by measuring the length of a shadow caused bythe sun's rays.
271 Switch A switch is used to start or stop an electric currentflowing in a circuit.
272 Synthetic material Materials that are man-made and which does notoccur naturally, such as plastics, PVC, styrofoam,nylon.
273 System A group of related parts working together to performa function. Usually include inputs, process andoutputs.
274 Telecommunications The use of radio waves to send and receive signalsfor communication purposes.
275 Temperature The degree of hotness or coldness of a body.
276 Testis The reproductive organ of the male animal whichproduces sperm.
Testes (plural)
277 Texture The way a material feels when it is touched.Example the surface of glass is smooth.
278 Thermometer An instrument used to measure the temperature of abody.
279 Time A duration for which an event occurs. Time ismeasured in seconds, minutes and hours within aday.
280 Tissue A group of cells organised to perform a particularfunction. Examples are skin tissue and musculartissue.
281 Translucent Allows some light to pass through. One can seethrough a translucent object but not very clearly. Anexample is frosted glass.
282 Transparent Allows most light to pass through it. One can seethrough a transparent material very clearly. Anexample is clear window glass.
283 Transpiration A process where water is drawn up by roots of aplant when water vapour evaporates from the leaves.
284 Umbilical cord A tube that conveys food, oxygen and blood from themother to the baby and removes waste productsfrom the baby.
285 Unicellular Organisms that are made of one cell are calledunicellular organisms.
286 Variable A factor that can be changed to determine theresultant effect on an experiment. Examples are thetemperature or light conditions.
287 Vein A blood vessel that carries blood rich in carbondioxide away from all parts of the body back to theheart.
288 Vertebrate Animal with backbone.
289 Vibration The movement to and fro about a fixed position.
290 Volume The amount of space taken up by an object.
291 Water vapour Water that is in gaseous state.
292 Wheel and axle A simple machine which is made from having abigger wheel joined to a smaller axle.
293 Windpipe The passage in the respiratory system that transferair from the nose to the lungs.
294 Womb The organ in females where the baby develops andgrows.
295 Work done The amount of work done is calculated by theproduct of Force and distance moved in the directionof the force. When a force is exerted on the wallwhich does not move at all, there is no work done!
296 Xylem The inner tube in a plant that transports water andmineral salts from the roots to the other parts of theplant.
plant.
297 Yeast A unicellular micro-organism that is commonly usedin the fermentation process and in the making ofbread.
Fermentation
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