1.
Food Chain

2.
I. Objectives
After going through this lesson, the learners
are expected to:
• Explain the purpose of a food chain and able
to give examples of food chains.
• Distinguish among the roles of producer,
consumers and decomposers; give example of
each
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3.
Food Chain: the transfer of energy from
one another organism to the next from
sun to producer to consumer, food chain
is just part of the overall food web found
in nature.
Herbivore: animal that eats only plants
Omnivore: an animal that can eat
plants and animals
Carnivore: a meat-eater
Decomposer: an organism that eats the
organic material that from the death and
decay of other life forms.
Science Concept:
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 Habitat: The place where an animal or
plant finds the food, water, shelter and
space in arrangement they need to
survive.
 Producer: a green plant that can make its
own food through photosynthesis
 Consumer: an organism that eats another
organism in order to get food
 Predator: an animal that catches, kills
and eats other animals
 Prey: animals that are killed and eaten by
predator

4.
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5.
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6.
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7.
Food chain is a linear sequence of organisms
through which nutrients and energy pass as
one organism eats another. In a food chain,
each organism occupies different tropic level,
defined by how many energy transfers
separate it from the basic input of the chain.
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8.
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Producers
Producer also known as autotrophs,
make their own food. They make up
first level of food chain. The green
plants or producers represent first
tropic level (T1). Autotrophs are usually
plants or one-celled organisms. Nearly
all autotrophs use a process called
photosynthesis to crate “food’’ (a
nutrient called glucose) from sunlight,
carbon dioxide and water.

9.
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Consumers
Consumers constitute the upper tropic levels.
Unlike producers, they cannot make their own food. To
get energy, they eat plants or other animals, while some
eat both. Primary consumers make up the second trophic
level (T2). They are also called herbivores.
Secondary consumers, which eat primary consumers.
Secondary consumers are mostly carnivores, from the
Latin words meaning “meat eater. Some
secondary consumers eat both plants and animals. They
are called omnivores, from the Latin words that mean
“eats everything.” Represent third tropic level (T3).
Ecosystem can also have tertiary consumers, carnivores
that eat other carnivores.

10.
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Decomposers
Decomposer is the last tropic level
(T5) plays a critical role in the flow of
energy through an ecosystem. They
break apart dead organisms into
simpler inorganic materials, making
nutrients available to primary
producers.

11.
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Aquatic
Seaweed Anchovetas Tuna Shark

12.
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Links in the food chain
Tropic
Level 5
Tropic
Level 4
Tropic
Level 3
Tropic
Level 2
Tropic
Level 1
Decomposers
Consumers 3
Omnivores
Consumers 2
Carnivores
Producers
Consumers 1
Herbivores

13.
A. Identification:
Direction: Write your answer in the blank provided.
Herbivores 1.What do we called that animals eat only plants?
Carnivores 2.Animals that eat other animals called?
Omnivores 3. Animals that eat both animals and plants are called?
Producer, consumer and decomposer 4. Food chain consists of?
Food chain 5.A linear sequence of organisms through which nutrients
and energy pass as one organism eats another animals are
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14.
B. Multiple choice
Direction: choose the letter of the correct answer.
1. Which among of this is the primary consumer?
A. sun
B. chayote
C. dandelion
D. woodchuck
2. Which of this is the producer?
A. oak acorn
B. gray squirrel
C. snake
D. hawk
3. A food chain starts with
(a) Nitrogen fixing organisms
(b) Photosynthesis
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15.
4. In a food chain, lion is a
(a) Secondary consumer
(b) Primary consumer
(c) Tertiary consumer
(d) Secondary producer
5. Which is the correct sequence in the food chain in grassland?
(a) Grass > wolf > deer > buffalo
(b) Bacteria > grass > rabbit > wolf
(c) Grass > insect > birds > snakes
(d) Grass > snake > insect > deer
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(c) Respiration
(d) Decomposers