Choose “Save as PDF” in the print dialog to keep a copy. The answer key prints on its own page at the end.

PetMat · 4th Grade (9-10)

Nature & science worksheet — 4th Grade (ages 9-10)

Name:

Date:

1. What Are Adaptations? – Surviving in Your Habitat

Adaptations & Classification

1. What is an adaptation?

AA type of food an animal eats

BA feature that helps a living thing survive in its habitat

CA migration route

DA way animals communicate

2. Which of these is an example of an adaptation?

AA rock rolling downhill

BRain falling in a forest

CA polar bear's thick white fur

DA tree being cut down

3. Why do living things develop adaptations?

ATo look more beautiful

BTo confuse scientists

CTo survive and reproduce in their environment

DTo travel faster

4. Adaptations can be physical features OR behaviours that help organisms survive.

True

False

5. Match each adaptation to its survival benefit.

		Your answer
1. Sharp claws	A. Reaches water deep underground
2. Camouflage colouring	B. Keeps the body warm in cold places
3. Thick layer of fat	C. Helps hide from predators
4. Long roots	D. Helps catch prey

2. Graph Patterns – Understanding What Heart Rate Data Tells Us

Advanced Body Systems (circulation & Respiration)

1. A graph shows heart rate at 80 bpm for 2 minutes, then rising to 160 bpm. What likely happened at the 2-minute mark?

AThe person fell asleep

BExercise began

CExercise ended

DThe person ate a meal

2. Looking at a heart rate graph, which section shows the recovery period after exercise?

AThe flat line at the start

BThe steep upward slope

CThe downward slope after the peak

DThe highest point on the graph

3. Two children exercise for 5 minutes. Child A's heart rate rises from 75 to 130 bpm. Child B's rises from 75 to 150 bpm. Who exercised MORE intensely?

AChild A

BChild B

CBoth the same

DNeither child exercised

4. A heart rate graph where the line quickly returns to the resting rate suggests the person has good cardiovascular fitness.

True

False

5. Match each graph description to the correct conclusion.

		Your answer
1. Heart rate stays low throughout	A. Person is physically fit
2. Heart rate spikes then slowly falls	B. Person is doing intense ongoing exercise
3. Heart rate rises sharply and stays high	C. Person exercised then recovered
4. Heart rate rises and returns to normal quickly	D. Person was resting the whole time

3. Digestive Organs – Know Your System

Digestion, Teeth & Excretion

1. Which organ absorbs most of the nutrients from digested food?

AMouth

BStomach

CSmall intestine

DLarge intestine

2. What does the esophagus do?

AProduces digestive juices

BPushes food from the mouth down to the stomach using muscle contractions

CAbsorbs water from food waste

DChews food into smaller pieces

3. How many main organs are in the digestive system pathway from mouth to exit?

4. Food travels through the digestive system in both directions – up and down.

True

False

5. Match each digestive organ to a key fact about it.

		Your answer
1. Mouth	A. Absorbs water and forms solid waste
2. Stomach	B. Long, coiled tube where nutrients are absorbed
3. Small intestine	C. Holds food and mixes it with acid
4. Large intestine	D. Chews food and mixes it with saliva

4. Producers, Consumers, Decomposers – Roles in an Ecosystem

Interdependence & Conservation

1. What is the role of decomposers in a food chain?

AThey eat living plants

BThey hunt herbivores for food

CThey break down dead organisms and return nutrients to the soil

DThey convert sunlight into food

2. Which organism is a secondary consumer?

AA plant that photosynthesises

BA rabbit that eats grass

CA fox that eats rabbits

DA mushroom that breaks down leaves

3. Why are producers (plants) essential to every food chain?

ABecause they are the largest organisms

BBecause they capture energy from the sun and make it available for all other organisms

CBecause they eat the most food

DBecause they live the longest

4. Without decomposers, dead matter would pile up and nutrients would never return to the soil for plants to use.

True

False

5. Match each role to an example organism.

		Your answer
1. Producer	A. Fungi – breaks down dead organisms
2. Primary consumer	B. Wolf – eats the cow
3. Secondary consumer	C. Cow – eats grass
4. Decomposer	D. Grass – makes food from sunlight

5. Taxonomy – The Science of Naming and Grouping Life

Adaptations & Classification

1. What is taxonomy?

AThe study of fossils

BThe science of naming and classifying living things into groups

CThe study of taxes and money

DThe study of weather patterns

2. Carl Linnaeus created the system of giving every species two Latin names. What is this system called?

AEvolutionary theory

BBinomial nomenclature

CDNA profiling

DEcosystem mapping

3. How does knowing that a new animal is a mammal help a scientist even before detailed study?

AIt tells the scientist the animal's name

BIt tells the scientist the animal is likely warm-blooded, has fur, and feeds young with milk

CIt tells the scientist exactly how long the animal lives

DIt tells the scientist where the animal was found

4. Classification systems are fixed and never change as new species are discovered.

True

False

5. Match each classification group level to its description (broadest to narrowest).

		Your answer
1. Kingdom	A. Groups related genera together – e.g. cat family
2. Class	B. Most specific group – organisms that can reproduce together
3. Species	C. Mid-level group – e.g. Mammals, Birds
4. Family	D. Broadest group – e.g. Animal Kingdom

6. Active Bodies – Why Moving More Means a Healthier Heart

Advanced Body Systems (circulation & Respiration)

1. The heart is a muscle. Like other muscles in the body, it becomes stronger when:

AYou rest it all the time

BYou use it regularly through exercise

CYou eat more sugar

DYou breathe more slowly

2. Which of these activities does NOT significantly strengthen the heart and lungs?

ASwimming

BCycling

CWatching television

DRunning

3. Why does a stronger heart help the whole body?

AIt makes the body grow taller faster

BIt pumps blood more efficiently, delivering more oxygen to all cells

CIt reduces the need for food

DIt makes you breathe more slowly

4. Regular exercise helps both the heart and the lungs work better and last longer.

True

False

5. Match each physical activity to the type of fitness benefit it mainly provides.

		Your answer
1. Running	A. Flexibility and breathing control
2. Swimming	B. Builds heart and lung endurance
3. Cycling	C. Cardiovascular and full-body fitness
4. Yoga / stretching	D. Strengthens heart and lungs (cardiovascular)

7. The Eggshell Experiment – Testing How Drinks Affect Teeth

Digestion, Teeth & Excretion

1. Why is an eggshell a good model for tooth enamel in an experiment?

ABecause eggs are white like teeth

BBecause eggshell is made of calcium carbonate, similar to the mineral in tooth enamel

CBecause eggshells are very soft and easy to break

DBecause both are found in the kitchen

2. In the eggshell experiment, an egg is placed in cola for 3 days. What would you most likely observe?

AThe eggshell becomes harder and brighter

BThe eggshell becomes discoloured and softer due to acid in the cola

CNothing changes – cola does not affect eggshells

DThe egg grows bigger

3. Which drink would you predict causes the LEAST damage to an eggshell in the experiment?

ACola

BOrange juice

CPlain water

DSports drink

4. The eggshell experiment shows us that acidic drinks can damage the outer layer of teeth over time.

True

False

5. Match each drink to the expected effect on eggshell after several days.

		Your answer
1. Plain water	A. Minimal damage – calcium may even help protect shell
2. Cola drink	B. Some surface damage – mildly acidic
3. Orange juice	C. Shell softens and discolours – very acidic
4. Milk	D. Little to no change – neutral pH

8. Footprint Comparison – Small Choices, Big Difference

Interdependence & Conservation

1. Which meal has a LARGER ecological footprint?

AA vegetable and lentil soup

BA beef burger with imported ingredients

CA locally grown apple

DA handful of nuts

2. Why does flying on an aeroplane have a large ecological footprint?

AAeroplanes make a lot of noise

BAeroplanes burn large amounts of fossil fuels which release CO₂ into the atmosphere

CAeroplanes travel through protected areas

DAeroplanes use a lot of water

3. Which of these choices has the SMALLEST ecological footprint?

ABuying a new phone every year

BRepairing and reusing your old phone as long as possible

CThrowing away your phone after 6 months

DKeeping your phone screen on permanently

4. The choices of many individuals added together can make a significant positive or negative impact on the environment.

True

False

5. Match each habit to whether it increases or decreases ecological footprint.

		Your answer
1. Using a reusable water bottle	A. Increases – high water, energy, and waste cost
2. Leaving electronics on standby all night	B. Decreases – reduces landfill waste and creates soil
3. Composting food scraps	C. Increases – wastes energy continuously
4. Buying fast fashion weekly	D. Decreases – less plastic waste produced

Nature & science worksheet — 4th Grade (ages 9-10)

Answer Key

1. What Are Adaptations? – Surviving in Your Habitat

1.B) A feature that helps a living thing survive in its habitat

2.C) A polar bear's thick white fur

3.C) To survive and reproduce in their environment

4.True

5.Sharp claws → Helps catch prey, Camouflage colouring → Helps hide from predators, Thick layer of fat → Keeps the body warm in cold places, Long roots → Reaches water deep underground

2. Graph Patterns – Understanding What Heart Rate Data Tells Us

1.B) Exercise began

2.C) The downward slope after the peak

3.B) Child B

4.True

5.Heart rate stays low throughout → Person was resting the whole time, Heart rate spikes then slowly falls → Person exercised then recovered, Heart rate rises sharply and stays high → Person is doing intense ongoing exercise, Heart rate rises and returns to normal quickly → Person is physically fit

3. Digestive Organs – Know Your System

1.C) Small intestine

2.B) Pushes food from the mouth down to the stomach using muscle contractions

3.C) 5

4.False

5.Mouth → Chews food and mixes it with saliva, Stomach → Holds food and mixes it with acid, Small intestine → Long, coiled tube where nutrients are absorbed, Large intestine → Absorbs water and forms solid waste

4. Producers, Consumers, Decomposers – Roles in an Ecosystem

1.C) They break down dead organisms and return nutrients to the soil

2.C) A fox that eats rabbits

3.B) Because they capture energy from the sun and make it available for all other organisms

4.True

5.Producer → Grass – makes food from sunlight, Primary consumer → Cow – eats grass, Secondary consumer → Wolf – eats the cow, Decomposer → Fungi – breaks down dead organisms

5. Taxonomy – The Science of Naming and Grouping Life

1.B) The science of naming and classifying living things into groups

2.B) Binomial nomenclature

3.B) It tells the scientist the animal is likely warm-blooded, has fur, and feeds young with milk

4.False

5.Kingdom → Broadest group – e.g. Animal Kingdom, Class → Mid-level group – e.g. Mammals, Birds, Species → Most specific group – organisms that can reproduce together, Family → Groups related genera together – e.g. cat family

6. Active Bodies – Why Moving More Means a Healthier Heart

1.B) You use it regularly through exercise

2.C) Watching television

3.B) It pumps blood more efficiently, delivering more oxygen to all cells

4.True

5.Running → Strengthens heart and lungs (cardiovascular), Swimming → Cardiovascular and full-body fitness, Cycling → Builds heart and lung endurance, Yoga / stretching → Flexibility and breathing control

7. The Eggshell Experiment – Testing How Drinks Affect Teeth

1.B) Because eggshell is made of calcium carbonate, similar to the mineral in tooth enamel

2.B) The eggshell becomes discoloured and softer due to acid in the cola

3.C) Plain water

4.True

5.Plain water → Little to no change – neutral pH, Cola drink → Shell softens and discolours – very acidic, Orange juice → Some surface damage – mildly acidic, Milk → Minimal damage – calcium may even help protect shell

8. Footprint Comparison – Small Choices, Big Difference

1.B) A beef burger with imported ingredients

2.B) Aeroplanes burn large amounts of fossil fuels which release CO₂ into the atmosphere

3.B) Repairing and reusing your old phone as long as possible

4.True

5.Using a reusable water bottle → Decreases – less plastic waste produced, Leaving electronics on standby all night → Increases – wastes energy continuously, Composting food scraps → Decreases – reduces landfill waste and creates soil, Buying fast fashion weekly → Increases – high water, energy, and waste cost