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Answer keys

In document Natural Science 2 Rr (Page 79-84)

1 WE ARE ALL DIFFERENT Page 6

1. Colour the main parts of the body.

(Ss colour the head red, the trunk blue and the limbs yellow.)

2. Look at the girl and classify the parts of the body.

head → hair, forehead, chin.

trunk → thorax, abdomen.

limbs → arm, hand, leg, foot.

Page 7

1. Look at the children and write.

Model Answer (M.A.):

different: Maia and Clara are girls. Yang is a boy. Maia has got dark skin. Yang and Clara have got light skin. Etc.

similar: They are all children. They have got hair / two eyes. Etc.

2. How are they feeling? Match and write.

(Ss write in order: happy, angry, sad.) 3. What makes you scared? Tick (✓).

Open Answer (O.A.)

2 THE SENSES AND MOVEMENT Page 8

1. Look and write the sense they are using.

taste; sight; touch; hearing; smell.

2. What are bones like? Tick (✓).

Bones are hard and rigid.

3. Look at the skeleton and answer the questions.

The humerus, the ulna and the radius join together at the elbow.

The femur, the fibula and the tibia join together at the knee.

Page 9

1. Find and circle five muscles.

calf muscle; biceps; gluteus; abdominal;

pectoral.

2. Read and write T (true) or F (false).

F; T; F; T; T.

3. Unscramble the sentences. Then, correct the false sentence.

You should wash your hands before you watch TV.

You should sleep at least ten hours every night.

You should use suntan cream when it is very sunny.

(Ss correct the first sentence.):

You should wash your hands before you eat.

3 NUTRITION Page 10

1. Choose the correct words to complete the sentences.

People need air, food and water to live.

To be healthy, we need to eat healthy food and breathe clean air.

2. Label the picture.

clockwise, from top left: nose; trachea;

lungs; mouth.

Answer keys

REINFORCEMENT

3. Write T (true) or F (false). Then, correct the false sentence.

T; T; T; F.

(Ss correct the last sentence.):

When you sleep, you breathe.

Page 11

1. Read and circle.

Food goes into your mouth. You chew food with your teeth. Your tongue helps mix the food with saliva. Then, food goes down your oesophagus and into your stomach.

2. Look at the food pyramid and answer the questions.

M.A.

several times a week→ rice, pasta, bread.

occasionally → cake, biscuits, cola.

every day → oranges, tomatoes, lettuce.

4 PLANTS

Page 12

1. Circle the living things.

(Ss circle the girl, the plant, the snake and the whale.)

2. Write the parts of the plants.

clockwise, from top left: leaf; flower;

stem; root; fruit.

3. Read and match.

The roots fix the plant to the ground.

The stem transports the nutrients around the plant.

The leaves absorb sunlight and air.

The seeds are inside the fruits.

Page 13

1. Read and match.

grasses → They are small and have got soft, thin stems.

bushes → They have got short, hard trunks.

trees → They have got long, hard, thick stems, called trunks.

2. How do plants reproduce? Read and

squid: invertebrate; snake: vertebrate;

bird: vertebrate; prawn: invertebrate;

crab: invertebrate; fish: vertebrate.

3. Write the parts of the insect.

clockwise, from top left: body; wing;

antenna; leg; head.

Page 15

1. What kind of animal is it? Tick (✓) the characteristics.

A cow is a vertebrate. It is viviparous.

It has got hair. It is a mammal.

An eagle is a vertebrate. It is oviparous.

It has got feathers. It is a bird.

2. How do amphibians reproduce? Look and write 1, 2, 3 and 4.

REINFORCEMENT

Answer keys

REINFORCEMENT

3. Which of these groups of animals are invertebrates? Colour.

(Ss colour insects.)

6 ECOSYSTEMS

Page 16

1. Where do these animals live? Match.

ocean → whale, fish, jellyfish and lobster.

forest → squirrel, owl, rabbit and deer.

2. Read and write the words.

Non-living things → rocks; water.

Living things → pine trees; eagle; grass.

Page 17

1. Colour the living things in this ecosystem.

(Ss colour everything except the water and the rocks.)

2. Look and tick (✓) the characteristics of this ecosystem. Then, answer the questions.

(Ss tick This is an aquatic ecosystem and This is salt water.)

living things → fish; octopus; prawn;

seaweed.

non-living things → water; sand.

3. Read and match.

Living things depend on each other for food and form a food chain.

7 MATERIALS Page 18

1. Look and classify the materials.

natural materials → wool; clay; wood, man-made materials → glass; paper;

plastic.

2. Read and tick (✓) the correct option.

A resistant material can support heavy weights.

An elastic material can stretch and return to its original shape.

A flexible material can bend without breaking.

Page 19

1. What materials are these objects made of? Why? Write.

A wheel is made of rubber because it is elastic.

A window is made of glass because it is transparent.

A T-shirt is made of cotton because it is flexible.

2. Which object is heavier? Look and circle.

(Ss circle the full jug and the statue of the bird.)

3. What do you use to measure things?

Match. Then, read and complete.

(Ss match the words to the objects.):

To measure the weight of an object we use scales.

To measure the volume of an object we use a jug of water.

REINFORCEMENT

8 FORCES AND ENERGY Page 20

1. Which force moves these types of transport? Use the colour key to circle.

blue: The force of the wind → sailing boat; balloon.

red: The force of people → scooter;

bicycle.

yellow: The force of a motor → car;

motorcycle.

2. Look and tick (✓).

Who is pulling the wheelbarrow? Lina.

Who is pushing the wheelbarrow?

Andrew.

(Ss draw an arrow pointing right.) 3. Which force pulls us down to the

ground? Colour the correct word.

(Ss colour the word gravity.) Page 21

1. What types of energy can you see in this picture? Write.

clockwise, from top left: sunlight; fuel;

electricity.

2. Look and match. Then, write renewable or non-renewable.

wind → wind turbine → renewable petroleum → oil rig → non-renewable sunlight → solar panels → renewable 3. What sound does this instrument

make? Read and tick (✓) two options.

It makes a loud sound.

It makes a high sound.

9 MACHINES

Page 22

1. Look and write the names of the machines.

simple machines → pulley; spade;

shears; rake.

complex machines → wagon;

lawnmower; wheelbarrow.

2. Match the jobs to the machines.

firefighter → hose cook → cooker carpenter → drill scientist → microscope Page 23

1. Write the name of a machine you use for each activity.

M.A.

to communicate with a friend → mobile phone

to travel with your family → car to cook → cooker

to clean the floor → vacuum cleaner to play a video game → console to put out a fire → hose

2. Which telephone is the oldest?

Which is the most modern? Write 1, 2, and 3.

3; 2; 1.

3. What do we use the Internet for?

Read and tick (✓).

For looking for information.

For communicating with people all over the world.

For watching films at home.

In document Natural Science 2 Rr (Page 79-84)

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