Unit 1 Living Things - LANGUAGE WORLD...Living things grow and change as they get older. 4. All animals use their senses to survive. 5. Living things need each other for food. tree

Interactive Science Reading Book 1 Answer Key

Unit 1 Living Things

THINK 1. Plants and animals are living things.

2. Rabbits and trees are living things. Pencils and tables are non-living things.

CHECK Your Understanding 1. c

2. a

3. b

4. b

Vocabulary

Critical Thinking

rabbit

tree

butterfly

pencil

table

rock

living thing move safe


Unit 2 Plants

THINK 1. A seed, stem, and roots are the parts of a plant.

2. A seedling grows from a seed and it grows into a stem. Then the roots go

down into the ground.

CHECK Your Understanding 1. a

2. a

3. b

4. a

Vocabulary

Critical Thinking

seed

seedling


Science Activity

Seeds sprout. Then the stem and roots grow.


Unit 3 Animals

THINK 1. An animal moves to find food and to stay safe.

2. A dog starts life small and changes its size as it gets older. Then it

becomes an adult.

CHECK Your Understanding 1. b

2. a, b

3. b

4. a

Vocabulary

Critical Thinking

small grows

changes

change life cycle small


Unit 4 Life and Learning

THINK 1. Animals need to keep themselves safe, find food and water, and rest.

2. We can look, listen, touch, taste, and smell things around us.


2. a

3. a

4. b

Vocabulary

Critical Thinking

Science Activity

I used a touch to figure out what was in the box.

It was hard to figure out what was in the box.

A sight and a smell would have made it easier to figure out what was in

the box.

e n s e m e l l u r v i v e a s t e

listen

taste

smell

touch

look


Unit 5 Sharing Our World

THINK 1. Living things share the air and water.

2. They need each other for food. For example, plants are food for many

animals.


2. c

3. b

4. b

Vocabulary

Critical Thinking

environment water share air


Review 1

1. False (An animal is not a living thing.)

2. False (Most plants grow from stems.) 3. True (Living things have a life cycle.) 4. True (Animals need to keep themselves safe.)

5. True (The place where plants and animals live is their environment.)

1. Animals move to find food.

2. A seedling grows from a seed.

3. Living things grow and change as they get older.

4. All animals use their senses to survive.

5. Living things need each other for food.

tree grass

cactus

dog bird

hamster


Unit 6 What Makes It Go?

THINK 1. We get energy from food.

2. Wind, moving water, electricity, and muscle power make things go.


2. b, c

3. a

4. a

Vocabulary

Critical Thinking

n e r g y l e c t r i c i t y u s c l e o w e r

moving water

electricity

muscle power


Unit 7 Nature’s Energy

THINK 1. People use wind and water energy.

2. Windmills use wind energy. Rafting uses water energy.


2. a, c

3. c

4. c

Vocabulary

Critical Thinking

Science Activity

The water balloon moved the ball 10cm from the line. The air balloon

moved the ball 8cm from the line.

The water balloon moved the ball farther.

I think water has more energy than wind.

windmill

wind surfing

rafting

watermill

wind natural wave turbine


Unit 8 The Sun

THINK 1. We get heat and light from the sun.

2. The sun heats the ground, plants, air, water, and animals.


2. a

3. c

4. b

Vocabulary

Critical Thinking

x y g e n a r t h e a t i g h t

air

plant

ground

water animal


Unit 9 Switch It Off

THINK 1. Electricity is important to our lives because it makes our lives better.

2. TV’s, telephones, and computers use electricity.


2. b

3. c

4. c

Vocabulary

Critical Thinking

e l e p h o n e w i t c h i r e o m p u t e r

refrigerator

radio

oven


Unit 10 Running Out of Energy

THINK 1. We should save energy because it doesn’t last forever.

2. We can ride a bike or walk, and recycle waste to save energy.


2. c

3. a

4. a, b

Vocabulary

Critical Thinking

recycle paper

walk

coal recycle oil fuel


Review 2

1. True

2. False

3. True

4. False

5. True

1. Energy is important to life on Earth.

2. Wind is a natural source of energy.

3. The sun gives out heat and light.

4. Electricity is made at a power station.

5. Coal and oil will not last forever.

n e r g y

u r b i n e

x y g e n

u e l

w i t c h


Unit 11 Watch the Weather

THINK 1. The sun makes the weather change.

2. The weather can be hot, cold, windy, wet, or sunny.


2. c

3. a, c

4. b

Vocabulary

Critical Thinking

rainy cloudy rainy rainy cloudy rainy


Unit 12 Changing Seasons

THINK 1. We have four seasons in one year.

2. In summer, Earth tilts towards the sun. In winter, Earth tilts away from

the sun.


2. b

3. c

4. b

Vocabulary

Critical Thinking

summer winter

sun

season tilt winter summer


Unit 13 Spring and Summer

THINK 1. Spring comes after winter.

2. In spring, trees start to grow leaves and flowers, and baby animals are

born. In summer, we get more hours of daylight and ripe fruits from trees.


2. a

3. a, b

4. b

Vocabulary

Critical Thinking

a y l i g h t p r i n g i p e n

The weather gets

warmer.

Many trees grow new

leaves.

Fruit ripens on trees.

Baby animals grow up.


Unit 14 Fall and Winter

THINK 1. The leaves on trees change their color and fall down to the ground.

2. In fall, some animals migrate to warmer places. In winter, many animals

grow thick coats and some animals hibernate.


2. a

3. c

4. c

Vocabulary

Critical Thinking

W

F W

F

fall hibernate migrate


Unit 15 Day and Night

THINK 1. In the day, animals wake up and look for food. At night, they usually sleep.

2. As Earth spins, the part facing the sun is lit up. It is day in that part of the

world. The other part of the Earth is in shadow. It is night in that part of

the world.

CHECK Your Understanding

1. a

2. c

3. b

4. c

Vocabulary

Critical Thinking

Science Activity

The part where the flash lighted was daytime.

The part where the flash didn’t light was night.

The place where I was changed because the ball spun itself.

It is day right now. The sun is where I am.

day

night

light shadow


Review 3

1. True (The sky changes with the weather.) 2. False (It takes a year for the sun to go around Earth.) 3. True (In spring, the weather gets warmer.)

4. True (Winter is the coldest season.) 5. False (All the animals sleep at night.)

1. weather

2. tilts

3. ripens

4. migrate

5. spins

D N N


Unit 16 Build It, Use It

THINK 1. Structures are some things that have been built.

2. Buildings, bridges, and umbrellas are the structures made by people.

Nests, burrows, and traps are the structures made by animals.


2. c

3. b

4. b

Vocabulary

Critical Thinking

umbrella

bridge

building

nest

trap

burrow

trap structure purpose shelter


Unit 17 Choose It, Strengthen It

THINK 1. People choose the best material for the purpose.

2. Skis are made of plastic and wood. Bridges are made of stone and wood.


2. c

3. a

4. b

Vocabulary

Critical Thinking

plastic, wood

metal, plastic

stone, wood

metal

wood, plastic

glass

design building material support


Unit 18 Join It, Move It

THINK 1. A structure is made of many parts.

2. A wheel makes a bicycle work and a battery makes a lantern work.


2. b

3. c

4. c

Vocabulary

Critical Thinking


Unit 19 Under It, Over It

THINK 1. The shape, design, and materials make structures strong.

2. Some vehicles such as buses can go over the bridge, and other vehicles

such as boats can go under the bridge.


2. a

3. c

4. a, c

Vocabulary

Critical Thinking

Science Activity

The rectangle was stronger.

The rectangle is often used in structures because it is stable.

a v i n e r i d g e b s t a c l e

airplanes, balloons, helicopters

canoes, ferries, ships

buses, bicycles


Unit 20 Re-Use It, Recycle It

THINK 1. We should recycle materials because old things can be made into new

things.

2. We can re-use or recycle plastic, glass, and metal.


2. a

3. a

4. b

Vocabulary

Critical Thinking

u r n i t u r e a n d f i l l e u s e

Paper Plastic

Food scraps


Review 4

1. Structures have a purpose.

2. People choose the best material for the purpose.

3. We use different things to hold parts together.

4. The design of a bridge makes it strong.

5. Plastic bags can be saved and re-used.

1. Some animals make traps to catch food.

2. Buildings have strong supports.

3. The parts make the structure work.

4. Boats can go under bridges.

5. Old tings can be made into new things.

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Unit 1 Living Things - LANGUAGE WORLD...Living things grow and change as they get older. 4. All animals use their senses to survive. 5. Living things need each other for food. tree