Materials: worksheet
Catalyst: (5 min)
1. In which organelle does cellular respiration take
place in eukaryotes?
2. In which organelle does photosynthesis take
place in eukaryotes?
3. What is the energy storing molecule that has 3
phosphate groups? (formed in cellular respiration)
4.What is the chemical reaction for photosynthesis?
5.What is the chemical reaction for cellular
respiration?
Materials: none
Catalyst: (5 min)
1. What is the difference between an autotroph and
a heterotroph?
2. What is the
primary
source of
food for small
fish?
3. Where does
all energy in
this food
chain
originate?
Elite Eight Trait Check-Up
1. Respect the Threshold
• Everyone on time?
• Silent for First Five?
2. Be Prepared (2 min)
• Seated
• Have materials
• Working on catalyst
Announcements
• I will be emailing your science expo reports back
this week with comments.
• Final Draft Due in hard copy Monday, Dec 9!
• Science Expo is Wednesday, Dec 11
• NEW TUTORIAL DAYS: Tuesday/Friday 3-4:30
Standard
SB4. Students will assess the
dependence of all organisms on one
another and the flow of energy and
matter within their ecosystems.
b. Explain the flow of matter and
energy through ecosystems by
arranging components of a food chain
according to energy flow.
Objectives
• I can differentiate between producers
and consumers
• I can interpret a food chain and food
web.
• I can explain the transfer of energy in
both a food chain and a food web.
Energy Transfer
How do living things obtain and use energy?
What is energy?
Energy is the ability to
do work
Organisms use energy to eat, breathe, and move.
The Transfer of Energy
All the energy on Earth originates (comes from)
the sun
Review
What is an autotroph?
Autotrophs produce their own energy
using sunlight
What is an heterotroph?
Heterotrophs obtain their energy from
eating other organisms
The Transfer of Energy
Autotrophs obtain energy from the sun through
photosynthesis
Autotrophs are also called producers
Why do you think
autotrophs are
called producers?
The Transfer of Energy
Heterotrophs obtain energy by eating other living
organisms
Heterotrophs are also called consumers
What does it mean to be a
consumer?
Think!
1. What is a producer? Are producers and autotrophs
the same thing? Explain.
Producers make their own food from photosynthesis
and is another name for autotrophs
2. What is an example of a producer?
Grass, trees, and plants are all producers
Think!
3. What is a consumer? Are consumers the same
thing as heterotrophs? Explain.
Consumers eat other organisms as their energy
source and are another name for heterotrophs
4. What is an example of a consumer?
Consumers include humans and all types of
heterotrophs
Heterotrophs
What are the different types of Heterotrophs?
Herbivores
Herbivores: only eat autotrophs, such as grass, berries,
and other plants.
When you see herbivore think herbs and
vegetarian!
Examples: Rabbits, deer, horses, and elephants
Can you think of
any more
herbivores?
Carnivores
Carnivores: eat only heterotrophs or other animals
When you see carnivores think meat eater!
Example: Lions, sharks, and snakes
Omnivores
Omnivores: eat both plants and animals
Example: Humans, Rats, Mice, and Pigs
Would a
vegetarian still be
considered an
omnivore?
Decomposers
Decomposers: eats dead or dying animals
Also known as Saprophytes or Scavengers
Example: Bacteria and fungi
Think:
What type of
heterotroph?
Herbivores, Carnivores,
Omnivores, or
Decomposers
Can eat both plants
(autotrophs) and animals
(heterotrophs)
Herbivores, Carnivores,
Omnivores, or
Decomposers
Herbivores, Carnivores,
Omnivores, or
Decomposers
Can eat only animals
(heterotrophs)
Herbivores, Carnivore,
Omnivore, or Decomposer
Eats dead or dying
organisms
Herbivores, Carnivores,
Omnivores, or
Decomposers
Herbivores, Carnivores,
Omnivores, or
Decomposers
Can eat only plants
(autotrophs)
Herbivores, Carnivore,
Omnivore, or Decomposer
Flow of Matter and
Energy in Ecosystems
Energy Flow
Energy flows (moves) in an ecosystem in the form of matter
Matter - the physical substance that makes up
everything (atoms)
Food chain: is a model that shows how matter
and energy move through an ecosystem
berries
mice
Tiger
The arrow shows who eats what or whom.
The arrow points towards the predator and
away from the prey
Nutrients and energy move from:
Producers
Consumers
Decomposers
Think
• In the food chain to the right,
what is the producer?
• Who eats the grass?
• Who gets energy from the
mouse?
What is the producer, consumer, and decomposer in
the food chain below?
In which direction does the energy flow?
Food Web: made up of multiple food chains
Food webs show all the possible feeding relationships for
each organism
A food web is more realistic than a food chain
because organisms depend on more than one other
species for food
1. What does the rabbit eat?
2. What eats the rabbit?
3. What would happen to the mouse, rabbit, and goat if all
the plants went extinct? How would this affect the lion?
Food Web Levels
Level 4: Tertiary Consumers (who eat Secondary
consumers)
Level 3: Secondary Consumers (who eat primary
consumers)
Level 2: Primary Consumers (who eat producers)
Level 1: Producers
Work Session
Panther
Pass
Question 1
The owl is a nocturnal hunter of small
mammals, insects and other birds. An owl is
an example of a/an?
A. Producer
B. Omnivore
C. Carnivore
D. Decomposer
Question 2
Which food would an herbivore always avoid?
A. Worms
B. Clover
C. Pine nuts
D. Grass
Question 3
Many types of bacteria obtain nutrition from
dead plants and animals. What type of
heterotrophs are bacteria?
A. Decomposers
B. Producers
C.Carnivores
D. Viruses
4. Is the mouse a
consumer or a
producer?
5. What does the hawk
eat?
6. What would
happen to the lizard
population if the
caterpillars went
extinct?