Republic of the Philippines
Department of Education
REGION XII – SOCCSKSARGEN
SCHOOLS DIVISION OF SOUTH COTABATO
POLOMOLOK I DISTRICT
JOSE NATIVIDAD JR. INTEGRATED SCHOOL
School
Teacher
Teaching
Date
Time
Jose Natividad Jr. Integrated
School
MRS. RHOSELLE G.
ALOJADO
November 22, 2024
Grade Level
Seven
Learning
Area
SCIENCE
Quarter
SECOND QUARTER
I. OBJECTIVES
1. Define the term "ecosystem" and identify its key components.
2. Create a visual representation of the energy flow within an ecosystem.
A. Content Standard
The learners learn that:
Identifying trophic levels helps understand the transfer of energy from one
organism to another, as shown in a food pyramid.
B. Performance
Standard
C. Learning
Competency
D. CONTENT
By the end of the Quarter, learners will explain the process of energy
transfer through trophic levels in food chains.
Describe the trophic levels of an organism as levels of energy in a food
pyramid.
The Ecosystem: Feel the Energy Flow
II. LEARNING
RESOURCES
1. References
1. Teacher’s Guide
pages
2. Learner’s Materials
pages
3. Textbook pages
4. Additional
Materials from
Learning Resource
(LR) portal
2.
Other Learning
Resource
Laurente, J. A., Garcia, R. J., Ole, F. C., Torio, V. A., & Osabel, A. (2015). Science for the
21st Century Learner 7. Makati City: DIWA LEARNING SYSTEM.
Papa, E. C., Pineda, M. G., & Santos, M. (2018). Practical Science 8 Textbook. Makati City:
DIWA LEARNING SYSTEM.
MooMooMath and
Science. (2023). Levels of Organization in
Biology –
Grade 7
Science. https://www.youtube.com/watch?
v=3G4aNOcTjbg.com
An Overview of Food Chain. (n.d.). https://byjus.com/biology/overview-of-food-chain/
C.
Process Skills
D.
Integration
SDG-3 Good Health and Well-being: Food pyramid as a fundamental guide in understanding the energy intake of an
individual
SDG-4 Quality Education: Biology Education and Ecological Research
SDG-13 Climate Action: Conservation of Ecosystem to preserve the ecological community
SDG-14 Life Below Water: Phytoplankton and green algae as a member of biological organization.
SDG-15 Life on Land: Biological Organization for biodiversity conservation, species protection, and understanding
ecosystems
III. TEACHING AND
LEARNING PROCEDURE
A. Activating
Prior Knowledge
1. Short Review
B. Establishing
Purpose
1. Lesson Purpose
1. Short Review (KWL Chart)
Using the graphic organizer, the students will answer the K column (What I know)
and W column (What I want to know).
Lesson Purpose
Let the pupils watch this video.
Guided Questions:
1. What is ecosystem?
2. How does energy flow through an ecosystem?
3. What is the main source of energy in an ecosystem?
4. Can you create a diagram of energy flow in an ecosystem?
2. Unlocking Content
Area Vocabulary
C. Developing and
Deepening
Understanding
What is an Ecosystem?
Definition: An ecosystem is a community of living organisms (biotic
factors) interacting with each other and their physical environment
(abiotic factors).
Key Components of an Ecosystem
Producers
Definition: Organisms that can produce their own food, usually through
photosynthesis.
Examples: Plants, algae, some bacteria.
Types of Consumers
Herbivores: Consume producers (e.g., deer, rabbits, caterpillars).
Consumers that feed on producers (plants and other autotrophs).
Carnivores: Consume other consumers (e.g., lions, sharks, spiders).
Organisms that obtain energy by consuming other organisms.
Omnivores: Consume both producers and consumers (e.g., humans, bears,
raccoons).
Consumers that feed on both producers (plants) and other consumers
(animals)
Decomposers
Definition: Organisms that break down dead organic matter and
recycle nutrients.
Examples: Fungi (e.g., mushrooms), bacteria.
Abiotic Factors
Definition: Non-living components of the ecosystem.
Examples:
Water (e.g., rivers, lakes, oceans)
Air (e.g., oxygen, carbon dioxide)
Soil (e.g., minerals, nutrients)
Sunlight
Energy Flow in an Ecosystem
The Sun as the Primary Source of Energy.
The sun is the ultimate source of energy for most ecosystems on Earth.
Solar energy drives the process of photosynthesis, which is the foundation of
energy flow in the ecosystem.
Photosynthesis: How Producers Capture Energy
Producers, such as plants and some microorganisms, are able to capture the
sun's energy and convert it into chemical energy in the form of glucose.
During photosynthesis, producers use the sun's energy, carbon dioxide, and
water to produce glucose and release oxygen as a byproduct.
Conversion of Solar Energy into Chemical Energy (Glucose)
The process of photosynthesis converts the sun's light energy into the
chemical energy stored in glucose molecules.
Glucose is then used by the producers as a source of energy for their growth
and maintenance, or it is passed on to consumers in the ecosystem.
Energy Pyramid
An energy pyramid, also known as a trophic pyramid or ecological pyramid, is
a graphical representation of the flow of energy within an ecosystem.
It depicts the relative amount of energy available at each trophic level, from
the producers at the base to the top-level consumers at the apex
.
Trophic Levels:
The pyramid is divided into different trophic levels, which represent the
feeding relationships in the ecosystem.
The trophic levels typically include:
Producers (e.g., plants, algae)
Primary consumers (herbivores)
Secondary consumers (carnivores that feed on herbivores)
Tertiary consumers (carnivores that feed on other carnivores)
Decomposers (e.g., fungi, bacteria)
Energy Flow:
Energy flows from the lower trophic levels to the higher trophic levels, as
organisms consume and transfer energy through the food chain.
The amount of energy available decreases at each successive trophic level,
as a significant portion of the energy is lost through respiration, heat, and
other processes.
Pyramid Structure:
The energy pyramid is typically depicted as a triangular or pyramidal shape,
with the producers forming the broad base and the higher-level consumers
forming the narrower apex.
The relative size of each trophic level in the pyramid represents the amount of
energy available at that level.
WORKED EXAMPLE
The diagram below is an example of an energy pyramid. Label the different
trophic levels of the energy pyramid using the word bank provided.
LESSON ACTIVITY
Constructing an Energy Flow Diagram
Ecosystem Research:
1. Divide the students into small groups (3-4 students per group).
2. Assign each group a specific ecosystem to research, such as a forest,
grassland, ocean, or desert.
3. Instruct the groups to identify the key producers, consumers, and
decomposers found in their assigned ecosystem.
Creating the Energy Flow Diagram:
1. Provide each group with a large sheet of poster paper and art supplies.
2. Ask the students to create a visual representation of the energy flow in their
assigned ecosystem.
3. Encourage them to use different colors, shapes, and sizes to represent the
various components and the flow of energy.
4. Students should include the following elements in their diagram:
=Sun as the primary source of energy
=Producers (e.g., plants, algae)
=Consumers (herbivores, carnivores, omnivores)
=Decomposers (e.g., fungi, bacteria)
=Arrows or other visual cues to show the transfer of energy
5. Invite each group to present their energy flow diagram to the class.
6. Encourage the students to explain the relationships between the different
components and how energy is transferred within their ecosystem.
Rubrics for Creating Energy Flow Diagram
D. Making
Generalizations
Relevant
Creativity
Cleanliness
Presentation
Total
50%
20%
20%
10%
100%
Learners’ Takeaways
KWL Chart: Using the graphic organizer, the students will answer the L
column or what they have learned about the given term.
IV.EVALUATING
LEARNING:
FORMATIVE ASSESSMENT
A. Evaluating Learning
1. Formative Assessment
Direction: Read each question carefully. Identify the letter of the correct
answer.
_________ 1. What is the primary source of energy for most ecosystems on Earth?
A. Wind
B. The sun
C. Decomposers
D. Abiotic factors
_________ 2. Which of the following organisms are able to capture the sun's
energy and convert it into chemical energy?
A. Consumers
B. Decomposers
C. Producers
D. Abiotic factors
_________ 3. Which of these is an example of a consumer in an ecosystem?
A. Grass
B. Mushroom
C. Deer
D. All of the above
_________ 4. What is the process by which producers, such as plants, use the sun's
energy, carbon dioxide, and water to produce glucose and release oxygen?
A. Respiration
B. Decomposition
C. Photosynthesis
D. Combustion
_________ 5. Which type of consumer feeds on both producers and other
consumers?
a) Herbivore
b) Carnivore
c) Omnivore
d) Decomposer
_________ 6. What is an ecosystem?
A) A community that involves interaction between biotic and abiotic factors
B) A group of animals in an ecosystem
C) A community where group of animals live together
D) All of the above
_________ 7. Which of the following is an example of an abiotic factor in an
ecosystem?
A. Deer
B. Soil
C. Algae
D. Fungi
_________ 8. In an energy pyramid, which trophic level typically has the largest
amount of energy available?
A. Producers
B. Primary consumers
C. Secondary consumers
D. Decomposers
_________ 9. What happens to the amount of energy available as you move up the
trophic levels in an energy pyramid?
A. It increases
B. It remains the same
C. It decreases
D. It fluctuates
_________ 10. How can human activities disrupt the energy flow within an
ecosystem?
A. By introducing new species
B. By reducing biodiversity
C. By altering abiotic factors
D. All of the above
Prepared by:
RHOSELLE G. ALOJADO
Science Teacher
Noted :
ALLAN S. TUATE
Principal I
Observed by:
MINCHELLE VILLANUEVA
Master Teacher I
Rubrics for Signage Construction
Content
Impact
Neatness
Total
50%
25%
25%
100%
Prepared by:
CHERRY T. ANTONIO
Teacher III