5.12A - Lesson 5 - Food Chains and Food Webs

LockeD! Science

Food
Chains and
Food Webs

Unit 5.12B – Lesson 5

Target: I will describe the flow of energy within a food web,
including the roles of the Sun, producers, consumers, and
decomposers.

Success Criteria: I will correctly identify the flow of energy
within a food web and the roles of various organisms.

Let's Review

Online
Learners

Living Things

● Things that:

○ are alive
○ grow
○ change
○ reproduce

Living Things

Crawfish

Living Things

Frog

Living Things

Trees

Living Things

Mushrooms

(Fungi)

Living Things

Listeria

(Bacteria)

NonLiving Things

● Things that:

○ Support living things
○ Do not grow
○ Do not change
○ Do not reproduce

NonLiving Things

Sunlight

NonLiving Things

Air

NonLiving Things

water

soil

NonLiving Things

LockeD! Science

Food
Chains and
Food Webs

5.12A – Lesson 1

Let’s See What You ALREADY Know!

Pre-Assessment!

Multiple Choice

What is the original source of energy in a food web?

• Decomposers

• Consumers

• Producers

• The Sun

Multiple Choice

The diagram shows a food web.  Which of the following gets it energy directly from a producer?

• The Sun

• Plants

• Deer

• Snake

Multiple Choice

The diagram shows a prairie food web.  In the food web shown, all of the following are consumers EXCEPT -

• The prairie grass

• The mountain lion

• the robin

• The squirrel

Multiple Choice

This is a food web diagram.  In the food web diagram, what do the arrows represent?

• The life cycle of each organism

• How one organism changes to another

• The flow of energy through an ecosystem

• how food is produced by many organisms

Multiple Choice

Decomposers like mushrooms get energy by -

• producing their own food

• eating grass, fruit, and seeds

• breaking down dead organisms

• absorbing carbon dioxide from the air

Food Chains

and

Food Webs

LockeD! Science

Food Chains and Food Webs

Essential Questions:

1. How can we
model the flow of
energy in an
ecosystem?

2. What are the
differences
between producers,
consumers, and
decomposers?

Reflect on the Essential
Questions before you dive in…

1. If you were quizzed today,
which questions would you
know the answers to already?

2. Which question would you
need to learn more about to
answer confidently?

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Poll

If you were quizzed right now, which question would you already know the answer to?

1. How can we model the flow of energy in an ecosystem?

2. What are the differences between a producer, consumer, and decomposer?

• Question 1 Only

• Questions 1 and 2

• Question 2 Only

• Neither question

• Energy is needed by all living things to
survive.

• Plants use energy from the Sun to make
food (energy) through a process called
photosynthesis.

• The plants’ energy transfers to animals that
eat them.

• The energy transfers again when other
animals that ate the plants.

Energy in Living Things

Food Chains and Food Webs

LockeD! Science

What role does the Sun play in providing energy for

living things?

Energy in Living Things
Food Chains and Food Webs

LockeD! Science

Arrows represent
the energy being
tranferred.

For example,
“grasshopper
frog” mean the frog
is receiving energy
from the
grasshopper.

Food Chains
use pictures
and arrows to
show a single
flow of energy
through an
ecosystem.

Energy in Ecosystems

Food Chains

LockeD! Science

Open Ended

What role does the Sun play in providing energy for living things?

Explain what would happen to the flow of energy if the
grasshopper disappeared from this food chain. How
might the producer population be affected? How might
the consumer population be affected?

Food Chains

LockeD! Science

Key Vocabulary

Food Webs

A PICTURE
IS WORTH A
THOUSAND

WORDS

Bacteria

One-celled organisms with no nucleus

carnivore

An animal that eats other animals for food

consumer

An organism that receives energy by eating other organisms

decomposer

An organism that receives energy by breaking down dead matter, returning nutrients to the environment

describe

To tell in written or spoken word

energy

The ability to do work or cause change

flow

The movement of energy, water, mud, or lava

Food chain

The sequence that traces food
energy in an ecosystem

Food web

A system of overlapping and connecting food chains in an ecosystem

Herbivore

A consumer that eats only plants

Omnivore

A consumer that eats plants and animals

predator

An animal that hunts other animals for food

prey

An animal that is hunted and eaten by a predator

Primary
consumer

An organism in a food chain that eats plants

producer

An organism that makes it own food

role

The function of something in a particular situation

scavenger

An animal that feeds on the remains of dead animals or garbage

Secondary
consumer

An organism in a food chain that eats primary consumers

Sun

The star at the center of our solar system which provides energy for Earth

Tertiary
Consumer

An organism in a food chain that eats
secondary consumers

Transfer

Move from one place to another

https://quizlet.com/_9d8ylo?x=1qqt&i=rwryh

“You can practice your vocabulary words on

Quizlet by using the link below.”

LockeD! Science

Food
Chains and
Food Webs

Unit 7B – Lesson 1

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