W5
Learning Area
SCIENCE
Grade Level
GRADE 8
Quarter
FOUR
Date
4 DAYS
I. LESSON TITLE
BIODIVERSITY
II. MOST ESSENTIAL LEARNING
COMPETENCIES (MELCs)
Explain the advantage of high biodiversity in maintaining the stability of an
ecosystem
Describe the transfer of energy through the trophic levels
III. CONTENT/CORE CONTENT
LIVING THINGS AND THEIR ENVIRONMENT
IV. LEARNING PHASES AND LEARNING ACTIVITIES
I. Introduction (Time Frame: ___DAY 1_____)
Biodiversity may be defined as the totality of different organisms, the genes they contain, and the ecosystems they
form. It refers to the number of biological species that exist in a given region. High biodiversity means that a region supports a
wide variety of species, while low biodiversity implies that an area supports only a few. The reasons for variances in biodiversity
are complex, but they include both natural and man-made causes.
The flow of energy is the most important factor that controls what kinds of organisms live in an ecosystem.In this packet,
you will learn the importance of high biodiversity in maintaining the stability of ecosystem and how organisms obtain energy
and how energy become transferred from one organism to another.
Learning Tasks 1: WORD UP!
Procedure: Identify the word(s) being described. Choose from the words given in the box.
_____________1. Feeding relatioship that exists among organisms.
_____________2. Refers to each step in the transfer of energy and matter in a community
_____________3. A community or group of living organisms that live in and interact with each other in a specific environment.
_____________4. A diagram that compares the enrgy used by producers,primary consumers,and other trophic levels.
_____________5. Has high number of species living in an ecosystem.
_____________6. When there are a few prominent species and a low number of other species within the habitat.
_____________7. Organisms that feed on and break down organic matter.
_____________8. Organisms that can make their own food in the ecosystem.
_____________9. Animals that feeds on flesh.
_____________10. A system of interlocking and interdependent food chains.
D. Development (Time Frame: __DAY 1______)
When an ecosystem has a high number of species present it means that it has a high biodiversity.The high number of species
ensures the stability of an ecosystem because it has a better chance of coping with environmental stressors such as
floods,droughts,and diseases.The variety of species means that when there is a decrease in the population of one
species,other species can compensate for their loss,thus minimizing the effects on the environment.
Learning Tasks 2. What is the Importance of Biodiversity to Ecosystem?
Procedure: Compare and Contrast the pictures of the ecosystem below
Food chain Energy pyramid Food Web Ecosystem Producers
Carnivores Decomposers Low diversity High biodiversity Trophic level
"Banana Plantation" by melalouise is licensed under CC BY 2.0
"Coral Reef (Community)" by The Open University (OU) is
licensed under CC BY-NC-ND 2.0
