Life Processes and Living Organisms: Interactive Learning Quizzes for Second Graders

Question 1

When we breathe, we take in oxygen and release carbon dioxide. This process is called respiration. In animals, where does respiration happen?

Accepted Answer

Lungs

Answer

Stomach

Answer

Heart

Answer

Brain

Question 2

How do plants and animals use oxygen during respiration?

Accepted Answer

Both plants and animals use oxygen to create energy.

Answer

Plants release oxygen as a waste product of respiration, while animals release carbon dioxide.

Answer

Plants take in carbon dioxide for respiration, while animals take in oxygen.

Question 3

How does the respiratory system help animals keep their body temperature steady?

Accepted Answer

It helps control how much heat is lost through breathing out.

Answer

It makes heat by breaking down sugar.

Answer

It keeps extra heat in the lungs.

Answer

It takes in heat from the air around them.

Question 4

How does the circulatory system help keep an animal's body healthy?

Accepted Answer

It carries food, air, and waste around the body.

Answer

It keeps the animal's body warm.

Answer

It helps the animal breathe.

Answer

It fights off germs.

Question 5

Polar bears live in freezing environments. Which adaptation helps them stay warm?

Accepted Answer

Thick fur

Answer

Fast swimming ability

Answer

Sharp teeth

Answer

Thin skin

Question 6

Camels have a unique feature that helps them survive in the desert's extreme temperatures. What is this special feature?

Accepted Answer

Ability to store fat in their hump

Answer

Thick fur coat

Answer

Long, thick eyelashes to keep sand out of their eyes

Question 7

What is the main job of the circulatory system in animals?

Accepted Answer

To carry food, oxygen, and waste around the body.

Answer

To help animals breathe.

Answer

To keep the animal's body warm or cool.

Answer

To protect the animal from getting sick.

Question 8

Which living things break down dead plants and animals, putting nutrients back into the soil?

Accepted Answer

Decomposers

Answer

Plants

Answer

Animals

Question 9

When two different living things live together in a way that helps both of them, it's called a helpful relationship. Which of these is an example of a helpful relationship?

Accepted Answer

A clownfish living in a sea anemone

Answer

A lion chasing a zebra to eat it

Answer

A bird building a nest in a tree

Answer

A mosquito biting a human

Question 10

Which animals have a special circulatory system where blood passes through the heart twice during one complete trip around the body?

Accepted Answer

Mammals

Accepted Answer

Birds

Answer

Fish

Question 11

When you shiver, how does your body use this to stay warm?

Accepted Answer

Your body shakes, creating heat to warm you up.

Answer

Shivering makes your blood flow faster, warming you up.

Answer

Shivering makes your skin thicker, trapping heat inside.

Question 12

Which animal has a stomach and teeth that are perfect for eating grass and leaves?

Accepted Answer

Cow

Answer

Lion

Answer

Shark

Answer

Eagle

Question 13

Why do all living things need to breathe?

Accepted Answer

To get energy

Answer

To get rid of waste

Answer

To grow

Question 14

How do animals remove waste from their bodies?

Accepted Answer

Animals have special organs like kidneys and liver that help them get rid of waste.

Answer

Animals sweat out waste.

Answer

Animals breathe out waste through their lungs.

Question 15

What do enzymes do during respiration?

Accepted Answer

Speed up chemical reactions

Answer

Create waste products

Answer

Are what we breathe in

Answer

Provide energy

Question 16

Desert plants have special features to help them survive with little water. Which of these is NOT a feature of desert plants?

Accepted Answer

Thin, green stems

Answer

Thick, waxy leaves

Answer

Long roots

Answer

Small leaves

Question 17

Which one is not a living thing?

Accepted Answer

A rock

Answer

A plant

Answer

A dog

Answer

A mushroom

Question 18

What do plants use to make their own food?

Accepted Answer

Sunlight, water, and air

Answer

Soil, fertilizer, and water

Answer

Oxygen, nutrients, and water

Answer

Air, water, and sunlight

Question 19

What part of a plant takes in water and nutrients from the soil?

Accepted Answer

The roots

Answer

The stem

Answer

The leaves

Answer

The flowers

Question 20

Which of the following is a sign of a living animal?

Accepted Answer

It moves on its own

Answer

It makes its own food

Answer

It has a hard shell

Answer

It is made of stone

Question 21

What is the process by which plants release oxygen into the air?

Accepted Answer

Photosynthesis

Answer

Breathing

Answer

Digestion

Answer

Reproduction

Question 22

What does the circulatory system do in animals?

Accepted Answer

Moves oxygen and food around the body

Answer

Protects the body from germs

Answer

Breaks down food

Answer

Keeps the body warm

Question 23

What are the four main types of food that living things need?

Accepted Answer

Carbs, protein, fats, and vitamins

Answer

Water, sunlight, oxygen, and minerals

Answer

Meat, veggies, fruits, and dairy

Answer

Sugar, salt, oil, and vinegar

Question 24

What do living things release into the air when they breathe out?

Accepted Answer

Carbon dioxide

Answer

Oxygen

Answer

Water

Answer

Sugar

Question 25

How do plants get their food, and how do animals get their food?

Accepted Answer

Plants make their own food, and animals eat other living things.

Answer

Animals make their own food, and plants eat other living things.

Answer

Both plants and animals make their own food.

Answer

Both plants and animals eat other living things.

Question 26

Which part of the plant takes in water and nutrients from the soil?

Accepted Answer

Roots

Answer

Leaves

Answer

Stems

Answer

Flowers

Question 27

How do plants create food?

Accepted Answer

Through photosynthesis

Answer

Through breathing

Answer

Through eating other organisms

Answer

Through absorbing nutrients from the soil

Question 28

Which animal breathes with lungs?

Accepted Answer

Bird

Answer

Fish

Answer

Frog

Answer

Snake

Question 29

What is the waste product of breathing in and out?

Accepted Answer

Carbon dioxide

Answer

Oxygen

Answer

Water

Answer

Glucose

Question 30

What part of a flower has the female reproductive organs?

Accepted Answer

Pistil

Answer

Petals

Answer

Sepals

Answer

Stamen

Question 31

How do animals create new animals?

Accepted Answer

Reproducing

Answer

Breathing

Answer

Excretion

Answer

Growing

Question 32

Which of these is a living thing?

Accepted Answer

Plant

Answer

Rock

Answer

Water

Answer

Book

Question 33

Which part of the plant helps it stand up tall?

Accepted Answer

Stem

Answer

Roots

Answer

Leaves

Answer

Flowers

Question 34

How do animals get rid of liquid waste?

Accepted Answer

Excretion

Answer

Breathing

Answer

Reproduction

Answer

Eating

Question 35

Scientists say a balanced ecosystem has a stable number of different living things. Which of these is a good example of a balanced ecosystem?

Accepted Answer

A forest with many different trees, animals, and other living things

Answer

A pond with only fish and no other living things

Answer

A field with only grass and no other plants or animals

Question 36

What is the main reason why animals need a healthy circulatory system?

Accepted Answer

To transport nutrients, oxygen, and waste throughout the body

Answer

To regulate body temperature

Answer

To fight off infections

Answer

To enable movement

Question 37

How does the nervous system help animals stay at a steady temperature?

Accepted Answer

The nervous system sends messages to muscles to make them shiver or sweat.

Answer

The nervous system stores energy to warm the body.

Answer

The nervous system releases hormones that change temperature.

Question 38

How do plants and animals get energy?

Accepted Answer

Plants use sunlight, while animals eat food.

Answer

Plants use oxygen, but animals don't.

Answer

Animals make carbon dioxide, but plants don't.

Answer

Animals have mitochondria, but plants don't.

Question 39

In photosynthesis, what is the main job of chlorophyll?

Accepted Answer

To capture sunlight and turn it into energy.

Answer

To release oxygen into the air.

Answer

To carry water and nutrients in the plant.

Answer

To make the plant strong and sturdy.

Question 40

Why do animals like chameleons have the ability to change the color of their skin?

Accepted Answer

To blend in with their surroundings and hide from predators

Answer

To attract mates

Answer

To regulate their body temperature

Question 41

How do decomposers help keep our environment healthy?

Accepted Answer

They break down plants and animals that have died.

Answer

They clean up our trash.

Answer

They make new plants grow.

Answer

They give us food.

Question 42

What is the main source of energy for plants?

Accepted Answer

Sunlight

Answer

Water

Answer

Air

Answer

Soil

Question 43

Which animal has a digestive system that is specially made to eat grass and plants?

Accepted Answer

Cow

Answer

Cat

Answer

Snake

Question 44

How does the circulatory system move blood around the body?

Accepted Answer

Through blood vessels, like veins and arteries

Answer

Through the lungs and stomach

Answer

Through the skin and bones

Question 45

Plants need oxygen to breathe. What do plants use oxygen for?

Accepted Answer

To break down food and release energy

Answer

To absorb water from the ground

Answer

To create food using sunlight

Answer

To transport nutrients around the plant

Question 46

In photosynthesis, water helps plants create food. How does water do this?

Accepted Answer

Water breaks down into hydrogen and oxygen.

Answer

Water provides energy for the process.

Answer

Water helps move nutrients through the plant.

Answer

Water releases carbon dioxide for the process.

Question 47

Where is NOT a place where plants and animals live together?

Accepted Answer

Playground

Answer

Forest

Answer

Ocean

Answer

Desert

Question 48

How does natural selection help animals change over time?

Accepted Answer

Animals with traits that help them survive and reproduce pass those traits to their offspring.

Answer

Animals with the most offspring are more likely to survive.

Answer

Animals can change their environment to suit their needs.

Question 49

Biodiversity refers to the variety of living things in an area. What is one advantage of having biodiversity?

Accepted Answer

Provides food and shelter for animals

Accepted Answer

Helps clean water and air

Accepted Answer

Supports pollination and seed dispersal

Answer

Increases competition for resources

Question 50

Why is it important to have many different types of living things in an ecosystem, like plants and animals?

Accepted Answer

It helps keep the ecosystem balanced, so that no one type of living thing becomes too powerful.

Answer

It makes the ecosystem more colorful and beautiful.

Answer

It gives us more food to eat.

Answer

It only causes problems for the living things in the ecosystem.

Question 51

How does excretion help animals stay healthy?

Accepted Answer

It helps animals get rid of waste products.

Answer

It helps animals breathe.

Answer

It helps animals grow and repair their bodies.

Answer

It helps animals protect themselves from danger.

Question 52

Desert animals have special features that help them survive in the hot, dry desert. Which of these is an adaptation that desert animals have developed?

Accepted Answer

Storing water in their bodies

Answer

Thick fur

Answer

Being active during the hottest part of the day

Question 53

Animals have special features that help them survive in their homes. What are these special features called?

Accepted Answer

Adaptations

Answer

Homes

Answer

Qualities

Answer

Skills

Question 54

What is homeostasis and why is it important for living things?

Accepted Answer

Keeping the body's conditions stable

Answer

Changing the body's shape and size

Answer

Helping the body create food

Answer

Protecting the body from danger

Question 55

What is a key job of the circulatory system in our bodies?

Accepted Answer

It delivers blood and important things like oxygen to our bodies.

Answer

It helps us breathe.

Answer

It protects us from getting sick.

Question 56

Animals have many ways to keep their body temperature just right. Which of these is NOT one of them?

Accepted Answer

Changing color

Answer

Shivering

Answer

Sweating

Answer

Panting

Question 57

What part of a plant helps it absorb water from the soil?

Accepted Answer

Roots

Answer

Stems

Answer

Leaves

Answer

Flowers

Question 58

How does the nervous system help animals protect themselves?

Accepted Answer

It helps animals sense danger and react quickly.

Answer

It helps animals find food and water.

Answer

It helps animals breathe.

Answer

It helps animals sleep.

Question 59

How does our body fight off germs?

Accepted Answer

By using special cells that attack germs

Answer

By coughing and sneezing to get rid of germs

Answer

By drinking plenty of water to flush out germs

Answer

By taking medicine to kill germs

Question 60

What's the difference between a food chain and a food web? Also, why are they important in nature?

Accepted Answer

A food chain shows how energy moves through a straight line of organisms, while a food web shows how energy flows through many interconnected paths.

Answer

Food chains are more common than food webs.

Answer

Food webs can only be found in the ocean.

Answer

Food chains and webs are not important in nature.

Question 61

Animals need oxygen to breathe. How do different animals breathe?

Accepted Answer

Animals have different ways of breathing depending on where they live.

Answer

All animals use lungs to breathe.

Answer

All animals breathe through their skin.

Question 62

How do animals remove waste products from their bodies?

Accepted Answer

Through their kidneys and intestines

Answer

Through their skin

Answer

Through their lungs

Question 63

How do plants use sunlight to create their own food?

Accepted Answer

Plants use sunlight, carbon dioxide, and chlorophyll to create food.

Answer

Plants absorb water from the soil to create food.

Answer

Plants consume insects to create food.

Answer

Plants obtain their food from the air.

Question 64

How do decomposers help keep an ecosystem healthy?

Accepted Answer

Decomposers break down dead plants and animals, releasing nutrients back into the soil for plants to use.

Answer

Decomposers produce the oxygen we breathe.

Answer

Decomposers prevent plants from getting sick.