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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
Interactive Science Reading Book 1 Answer Key
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
Interactive Science Reading Book 1 Answer Key
Science Activity
Seeds sprout. Then the stem and roots grow.
Interactive Science Reading Book 1 Answer Key
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
Interactive Science Reading Book 1 Answer Key
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.
CHECK Your Understanding 1. c
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
Interactive Science Reading Book 1 Answer Key
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.
CHECK Your Understanding 1. b
2. c
3. b
4. b
Vocabulary
Critical Thinking
environment water share air
Interactive Science Reading Book 1 Answer Key
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
Interactive Science Reading Book 1 Answer Key
Unit 6 What Makes It Go?
THINK 1. We get energy from food.
2. Wind, moving water, electricity, and muscle power make things go.
CHECK Your Understanding 1. a
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
Interactive Science Reading Book 1 Answer Key
Unit 7 Nature’s Energy
THINK 1. People use wind and water energy.
2. Windmills use wind energy. Rafting uses water energy.
CHECK Your Understanding 1. b
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
Interactive Science Reading Book 1 Answer Key
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.
CHECK Your Understanding 1. c
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
Interactive Science Reading Book 1 Answer Key
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.
CHECK Your Understanding 1. b
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
Interactive Science Reading Book 1 Answer Key
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.
CHECK Your Understanding 1. b
2. c
3. a
4. a, b
Vocabulary
Critical Thinking
recycle paper
walk
coal recycle oil fuel
Interactive Science Reading Book 1 Answer Key
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
Interactive Science Reading Book 1 Answer Key
Unit 11 Watch the Weather
THINK 1. The sun makes the weather change.
2. The weather can be hot, cold, windy, wet, or sunny.
CHECK Your Understanding 1. a
2. c
3. a, c
4. b
Vocabulary
Critical Thinking
rainy cloudy rainy rainy cloudy rainy
Interactive Science Reading Book 1 Answer Key
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.
CHECK Your Understanding 1. a
2. b
3. c
4. b
Vocabulary
Critical Thinking
summer winter
sun
season tilt winter summer
Interactive Science Reading Book 1 Answer Key
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.
CHECK Your Understanding 1. c
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.
Interactive Science Reading Book 1 Answer Key
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.
CHECK Your Understanding 1. b
2. a
3. c
4. c
Vocabulary
Critical Thinking
W
F W
F
fall hibernate migrate
Interactive Science Reading Book 1 Answer Key
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
Interactive Science Reading Book 1 Answer Key
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
Interactive Science Reading Book 1 Answer Key
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.
CHECK Your Understanding 1. a
2. c
3. b
4. b
Vocabulary
Critical Thinking
umbrella
bridge
building
nest
trap
burrow
trap structure purpose shelter
Interactive Science Reading Book 1 Answer Key
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.
CHECK Your Understanding 1. c
2. c
3. a
4. b
Vocabulary
Critical Thinking
plastic, wood
metal, plastic
stone, wood
metal
wood, plastic
glass
design building material support
Interactive Science Reading Book 1 Answer Key
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.
CHECK Your Understanding 1. a
2. b
3. c
4. c
Vocabulary
Critical Thinking
Interactive Science Reading Book 1 Answer Key
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.
CHECK Your Understanding 1. c
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
Interactive Science Reading Book 1 Answer Key
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.
CHECK Your Understanding 1. b
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
Interactive Science Reading Book 1 Answer Key
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.