NOTES: NEW OXFORD PRIMARY SCIENCE LEVEL3 SECOND EDITION NICHOLAS HORSBURGH
Class:3 SCIENCE-3
U#1 THE FIVE SENSES P#07-08
A:
Question:1
Make a list of ways in which people protect their eyes? |
Answer:
People protect their eye sight by: a) using glasses b) having their eyes checked by an eye doctor c) not reading while lying down |
Question:2
What corrects the image of an object seen by the eye? |
Answer:
The image of an object seen by the eye is corrected by the brain. |
Question:3
What two important functions do the ears perform? |
Answer:
The ears; a) help us to hear. b) maintain our balance. |
Question:4
Why is it dangerous to put any long, sharp object into the ear canal? |
Answer:
It is dangerous to put any long, sharp object into the ear. |
Question:5
Do all things give off a smell? |
Answer:
Almost everything produces odour particles. |
Question:6
Why are there fine hairs in the nostrils? |
Answer:
The fine hairs in the nostrils filter all kinds of things trying to enter the nose. |
Question:7
What happens to Hour sense of smell when you have a cold? |
Answer:
Sense of smell becomes weak. |
Question:8
In what ways is the sense of smell useful? |
Answer:
The sense of smell is useful; 1.in smelling flowers and perfumes. 2.It helps us to identify pollution. 3.in dangers. 4. It helps us to savour our food while it is cooking. |
Question:9
How do the taste buds help us enjoy food? |
Answer:
Our taste buds send a message to our brain, to tell us which flavours we are tasting. |
Question:10
What are the different kinds of tastes? |
Answer:
The different kinds of taste are sweet, salty, sour, and bitte |
Question:11
Can you touch your nose with the tip of Hour tongue? |
Answer:
Some people can do all sorts of things with their tongue—twist it round, roll it back, curl it, and even touch their nose with it. |
Question:12
Is the top layer of the skin dead or alive? |
Answer:
The top layer of the skin is alive. |
Question:13
What are receptors? What job do they do? |
Answer:
Receptors are tiny blood vessels and nerves. They relay information to the brain about the things our body comes into contact with. |
B: SELECT THE CORRECT ANSWER FROM THE CHOICES LISTED.
- The taste buds help us to recognize a) shapes b)flavours c) healthy food
- The eyes lie in sockets in the a) joints b)nostrils c) skull
- Our ——————— gets message from our sences to tell us what we see, smell, taste, heari,feel a)heart b)brain c) stomach
- The five senses————————– a) sight, hearing, taste, touch, and smell b)bones,muscles, brain,heart and hands c) reading, maths, spelling, running and writing
Ans: (1-b) (2-c)(3-b)(4-a)
Unit:2 FOOD CHAINS page:14
I: COMPLETE THE FOLLOWING SENTENCES:
- Decomposers feed on ————————————
- Only producers can make ——————————-
- Consumers are those living things that cannot ——————————-
- A food chain shows —————————————
Answers: (a-dead bodies of animals and plants ) (b- their own food) (c- produce their own food) (d-how all living things depend upon each other )
2: READ THE FOOD CHAIN BELOW.
cabbage88caterpillar88sparrow88eagle
Which of the above is a producer and which are consumers?
Answer: CABBAGE is producer
CATERPILLAR ,SPARROW AND EAGLE are consumers
3 DRAW OR GLUE A PICTURE OF A HERBIVORE, A CARNIVORE AND AN OMNIVORE IN YOUR BOOK. WRITE A SENTENCE ABOUT WHAT THEY EAT.
4 Which is the correct food chain?
- grass8 deer8 lion
- lion8 grass 8deer
- deer8 lion8grass
answer: (a)
- Which animal might complete this food chain?
lettuce 8 _____________ 8bird8fox
Answer: caterpiller
Unit:3 INSECTS Page:18
Question:1
Explain one difference between the honeybee and the locust? |
Answer:
The honeybee is of use to us as it provides us with honey, and helps to pollinate flowers. The locust is a pest. It destroys plants and crops. |
Question:2
What is the difference between an insect and a bird? |
Answer:
An insect has three pairs of legs, while a bird has a single pair of legs. Insects do not have bones, while a bird has light and hollow bones that allow it to fly. |
Question:3
The human body is supported and protected by the skeleton. What protects and supports an insect’s body? |
Answer:
An insect’s body is supported and protected by a hard covering called chitin. |
4 Fill in the blanks using words from the box below.
Wings, colony, chitin , kinds, diseases, bones, locusts |
- Species of insects means—————of insects.
- Most insects have——————–attached to them that help them to fly.
- A———————is a large group of insects living together.
- Insects such as ———————can destroy crops.
- Flies and mosquitoes can cause—————————
- Insects do not have——————-, but are covered and
supported by——————–
Answers: a) kinds b) wings c) colony d) locusts e) diseases f) bones g)chitin
5: Make a fact file on insects like the one below
What insects have | Some common insects | Insects causing harm | Insect diet |
6:LABEL THE PARTS OF THE INSECT SHOWN ON THE DRAWING:
UNIT:4 WHAT PLANTS PRODUCE Page:25
1: MATCH THE FOLLOWING:
COLUMN-A | COLUMN-B |
1.Tomato
2.Carrot 3.Pea 4.Lettuce 5.cauliflower |
a.Root
b.Leaf Bud c.Flower bud d.Seed e.fruit |
Answer:(1-e) (2-a) (3-d) (4-b) (5-c)
Question:2
Why are the tomato and chilli both considered to be fruits? |
Answer:
Tomato and chilli are considered to be fruits because they contain seeds. |
Question:3
In a table write one example for each of the following: leaf bud , leaf, root, stem, tuber, flower bud, seed, fruit and bulb. |
ANSWER:
1. leaf bud lettuce 2.leaf spinach 3.root turnip 4.stem sugar cane 5. tuber potato 6.flower bud cauliflower 7.seed peas 8.fruit tomato 9.bulb onion |
4: Fill in the blanks using the correct word from the brackets.
- ———————-make food for the plant.
(FLOWERS, LEAVES)
- Roots absorb—————–
(SOIL, WATER)
- Stems move water and nutrients to the——————
(SEEDS, LEAVES)
d)Fruits grow from—————————————(STEM, FLOWERS) and contain————————— . (SEEDS, ROOTS)
- Answers: a) Leaves b) water c) leaves d) flowers, seeds
UNIT:5 Life cycle of plants page:29
1 FILL IN EACH BLANK USING THE CORRECT WORD FROM THE BOX.
Wind, animals, germinates, water, seed, fruit ,Sun |
- Every plant starts life as a —————-
- A seed———————when it begins to grow into a plant.
- The seed is inside the plant’s—————–
- Seeds are spread by the ———————–and ———————
- Plants make their own food using energy from the ————————–
ANSWERS:
- a) seed b) germinates c) fruit d) wind, water, and animals e) Sun
Question:2
How does PHOTOSYNTHESIS help plants? |
Answer:
Photosynthesis helps plants to make their own food, using sunlight, water, carbon dioxide and chlorophyll. |
Question:3
Explain the functions of roots and leaves. |
Answer:
Roots help to hold the plant firmly in the soil. Also, they absorb water and nutrients from the soil. In many plants, they store food. |
Question:4
How do some animals help plants? |
Answer:
Some animals, for example birds, bees and squirrels, help plants in the dispersal of their seeds. |
5 ORDER THE STEPS OF THE LIFE CYCLE OF A PLANT BY NUMBERING THEM CORRECTLY.
The plant flowers.
The fruit releases seeds.
The plant grows.
A new life cycle begins.
The flower produces fruits.
The seed germinates.
Answers:( iii)+ (v)+ (ii)+( vi)+( iv)+(i) |
Unit:6 Materials Page:35,36
A: What am I?
- I am made from chemicals and do not conduct electricity.—————-
- I am made from wood and can burn easily.—————-
- I am strong and can be changed into any shape by hammering.—————
- I am transparent and can break easily.—————-
- I am a thread used to weave cloth.——————
Answers:A1.Plastic 2. Paper 3. Metal 4. Glass 5. Fibre
B: Name the term for:
- materials that are not found naturally but are made from chemicals —-
- strong, hard, and shiny materials that can be hammered into different shapes without breaking———————
- materials through which heat can travel easily
- materials that are attracted to magnets—————–
- material that is difficult to scratch——————-
- material that is easy to bend——————-
7.material that is very difficult to break———————-
8.material that does not let water pass through————————–
- long,thin threads of material, like hair———————————-
10.any material through which electricity can travel easily——————–
Answers: B 1. Plastics 2. Metals 3. Conductors of heat
- Magnetic 5. Strong and hard 6. Flexible 7. Strong and hard
- Waterproof 9. Fibres 10. Metal
Unit:7 The solar system Page:42
A: ANSWER THE FOLLOWING:
Question:1
List the different objects in space with an example of each one. |
Answer: stars (example: Sun),
planets (example: any of the eight planets), dwarf planet (example: Pluto; Eris and Ceres are some other dwarf planets present in the solar system;) natural satellite (example: moon). |
Question:2
Think and write about how the Earth is different from the other planets. |
Answer:
Earth has a moderate temperature allowing the survival of living organisms. It has water, air and seasons. |
Question:3
Order the eight planets according to their distance from the Sun? |
Answer:
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune |
Question:4
How is a planet different from a moon? In what way is a moon similar to a planet? |
Answer: Difference:
A planet is an object that circles the Sun, while a moon is an object that circles a planet. Similarity: Both a moon and a planet have no light of their own, but reflect the Sun’s light. |
B:NAME THE FOLLOWING:
1.The coldest planet of the solar system | |
2.The largest planet of the solar system | |
3. Scientists who study the space and the objects in it | |
4. the natural satellite of the Earth | |
5. one complete turn of the Earth on its axis | |
6. one complete round of the Earth on its orbit |
B 1. Neptune 2. Jupiter 3. Astronomers 4. the Moon 5. 24 hours
- 365¼ days
Unit:8 Wind and air page:45
A:
Question:1 Copy the table below. Compare the differences between space and atmosphere. |
Answer:
Atmosphere • has air and gases • is able to maintain life on the Earth • has winds and temperature creating rain, snowfall, clouds, etc. Space • has no air and gases • is not able to maintain life • absence of wind and temperature
|
Question:2 How do you think astronauts breathe in space? |
Answer: As there is no air in space, astronauts take an oxygen supply with them. |
Question:3 We cannot see, taste or smell air, but we can feel it. Explain how? |
Answer: By the smoke rising from the chimneys;
by the movement of flags, trees, kites, etc. |
Question:4 What is air made of? |
Answer: Air is made up of gases – oxygen, nitrogen, carbon dioxide, and water vapour. |
Question:5 What do we call air which has been squeezed? |
Answer: Compressed air is air that is squeezed into a small space. |
B: Mark the correct statements with a?and the wrong ones with a x.
- Carbon dioxide is the most important gas present in the air.
- There is no air in space.
- Warm air is heavier than cold air.
- Compressed air is present in a tyre.
- There is more air higher up in the atmosphere.
- Wind is moving air.
Answers: B (1. 7) ( 2. 3) (3. 7) (4. 3) (5. 7) (6. 3)
Unit:9 Circuits page:48,49
1: Fill in each blank using the words in the box.
complete, conductors, insulators, circuit |
- The path through which a current flows is called——————
- A——————-circuit is needed for an electric current to flow.
- Materials that allow electricity to pass through them are called———————
- Materials that do not allow electricity to pass through them are called——————–
Answers: 1. a) circuit b) complete c) conductors d) insulators
Question:2 What does the word circuit mean? |
Answer: The path along which an electric current flows is called a circuit.
|
Question:3 What is electricity which moves along wires called? |
Answer: Electricity that moves along wires is called an electric current.
|
Question:4 Why does flex have a thin layer of plastic on the outside? |
Answer: Flex is coated with a thin layer of plastic because plastic is an insulator.
|
5: Mark the correct statements with a ? and the wrong ones with a x.
- The filament is the path along which electric current flows.
- Metal and water are conductors of electricity.
- A gap in the circuit will allow electric current to flow.
- A complete circuit allows electric current to flow.
A pencil and a wooden ruler are good conductors of electricity.
Answers: 5: a) 7 b) 4 c) 7 d) 4 e) 7
Unit:10 Fun with magnets page:53
1:
Question:b) How are magnets useful to us? |
Answer: Magnets are useful to us because they are used in telephones, radios, stereos, computers, washing machines, etc. |
Question:c) Find out from the Internet how maglev trains work. |
Answer: The pupils can search the Internet to find out that like poles on magnets keep the train floating above the tracks. Its top sped is about 280 km/h.
|
2: Fill in each blank with the correct word from the bracket.
1.All magnets have ———————poles. (three/ two)
2.An iron nail is not attracted to a magnet if it is——————- the magnet’s magnetic field. (near to, far from)
3.————————materials are attracted to magnets.
(Some/ All)
4.A magnet’s power is ————————–at the poles.
(strongest/ weakest)
Answers: 2. a) two b) far from c) some d) strongest
Unit:11 Energy page:58
Question:1 a) What is energy? |
Answer: Energy is the power to do work.
|
Question:1 b) Where does the energy in our food come from? |
Answer:The energy in our food comes from the Sun.
|
Question:1 c) How do we use energy? |
Answer: We use energy while working.
|
Question:1 d) Where do machines get energy from? |
Answer:Machines get energy from fuels like petrol, diesel, coal, or natural gas.
|
Question:1 e) Give two examples of stored energy. |
Answer: Two examples of stored energy: the food we eat, and plants. |
Question:2 Do you use natural gas at home? How and where is it used? |
Answer: We use natural gas at home in our kitchens to cook food, and in heaters and geysers.
|
Unit:12 Force page:62
1:Answer the following questions.
Question:1a) What is a force? |
Answer:Force is a push or pull. |
Question: 1b) List three different types of forces. |
Answer: Three different types of force are:
frictional force, gravitational force and magnetic force. |
Question: 1c) What can a force do? |
Answer: A force can cause objects to change shape change the way they move, or cause an object to move in a new direction. Force can also make a moving object come to a stop. The speed of a moving object can increase or decrease depending upon the amount of force applied to it. |
Question: 1d) Objects do not fly up, move backward or forward, but fall down when you let go of them? Why? |
Answer:Objects fall down because of the force of gravity. |
3: Fill in the blanks using the correct words/phrases from the brackets.
- ———————-is a natural force. (Wind, Electricity)
- A horse cart is moving due to force produced by the —————————(cart, horse)
- The force of gravity keeps everything firmly——————————(on the ground, in the air)
Answers: 3. a) wind b) horse c) on the ground
Unit:13 Sounds page:65
1: Mark the correct statements with a ? and the wrong ones with a X.
- Sound waves can travel only through water and other liquids.
- High or low sounds mean high or low pitched sounds.
- Sound waves travel in one direction.
- You can have sound without anything vibrating.
- Very loud sounds can damage hearing.
- Less vibration creates louder sound.
Answers: 1. a) x b) / c) x d) x e) x f) / g) x
Unit 14 Light and shadow page:70
Answers:
- a) true b false c) true d) false e) false
Question: 2-a) |
Answer: Luminous objects are those objects which give off their own light. Examples: the Sun, a street lamp, a torch, a TV set that is on. |
Question: 2-b) |
Answer: Light travels in straight lines called rays. |
Question: 2-c) |
Answer: Light travels faster than sound. |
Question: 2-d) |
Answer: Shadows are longer in the morning, when the Sun is lower on the horizon, than at midday.
|
Question: 2-e) |
Answer: As the Sun is the biggest source of light, it gives off more energy in one second than the total energy ever used on the Earth.
|
Question: 2-f) |
Answer:
Transparent materials are those materials through which light can pass easily, e.g., glass. Translucent materials are those materials through which only a little light can pass, e.g. tissue paper. Opaque objects do not allow light rays to pass through them, e.g., a book.
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