8
SCIENCE
Quarter 4 - Module 8
Impact of Human Activities
in an Ecosystem
Science — Grade 8
Alternative Delivery Mode
Quarter 4 – Module 8: Impact of Human Activities in an Ecosystem
First Edition, 2020
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Published by the Department of Education – Division of Gingoog City
Division Superintendent: Jesnar Dems S. Torres, PhD, CESO VI
Development Team of the Module
Writer(s):
Eleonor I. Tubo
Reviewer(s):
Nilda U. Villegas, EPS – Science
Florida D. Arias, PhD, PSDS
Melinda R. Garabato, PhD
Illustrator(s):
Jay Michael D. Calipusan, PDO II
Layout Artist:
Virra Jill V. Durado
Management Team
Chairperson:
Jesnar Dems S. Torres, PhD, CESO VI
Schools Division Superintendent
Co-Chairperson:
Conniebel C. Nistal, PhD
Assistant Schools Division Superintendent
Pablito B. Altubar
CID Chief
Members:
Nilda U. Villegas, EPS – Science
Himaya B. Sinatao, LRMS Manager
Jay Michael A. Calipusan, PDO II
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gingoog.city@deped.gov.ph
8
SCIENCE
Quarter 4 - Module 8
Impact of Human Activities
in an Ecosystem
This page is intentionally blank.
Table of Contents
What This Module is About ......................................................................................................... i
What I Need to Know .................................................................................................................. i
How to Learn from this Module .................................................................................................. ii
Icons of this Module ................................................................................................................... ii
What I Know (Pre-Test) ............................................................................................................ iii
Ways to Minimize Human Impact to the Environment .............................................................. 1
What’s In .................................................................................................................................... 1
Activity 1: Fill Me! ................................................................................................................... 1
What I Need to Know ................................................................................................................. 2
What’s New ................................................................................................................................ 2
Activity 2: Let’s Find Out ........................................................................................................ 2
What Is It .................................................................................................................................... 3
What’s More ............................................................................................................................... 4
Activity 3: Let’s Minimize ........................................................................................................ 4
What I Have Learned ................................................................................................................. 5
Activity 4: Human Impact in the Environment… Good or Bad? ............................................ 5
What I Can Do ........................................................................................................................... 6
Activity 5: Tell Me You Can… Tell Me a Story ...................................................................... 6
Summary .................................................................................................................................... 7
Assessment (Post-Test) ............................................................................................................ 8
Key to Answers .......................................................................................................................... 9
References ............................................................................................................................... 10
This page is intentionally blank.
What This Module is About
In Grade 7, you study the Philippine environment and the conservation of its natural
resources. Did you have fun learning about conserving and protecting natural resources?
Have you identified the effects of some human activities on natural resources? Did you
suggest ways to reduce the effects? If so, there are more than awaits you in this module.
You’ve got to learn more about how human activities make an impact on the environment.
Humans are said to be the stewards of God’s creation. We are provided with
resources, enough to support our basic needs. However, man intervenes in the natural law of
order and created an imbalance in the ecosystem. Man’s activities have brought a huge impact
on its environment, causing a drastic change and long-lasting consequences.
As you continue to explore and study this module, you will soon realize that as young
as you are YOU can make a difference in the place that surrounds you. Start right by taking
seriously your learning and understanding of your environment, the inter-connectivity and
importance of organisms, and their interaction with each other in the circle called life.
This module contains one lesson only, but rest assured you will be challenged by
different activities included in this learning package.
Lesson 1- Ways to Minimize Human Impact to the Environment
What I Need to Know
At the end of this module, you should be able to:
1. Suggest ways to minimize human impacts to the environment. (S8LT-IVj-25)
i
How to Learn from this Module
To achieve the objectives cited above, you are to do the following:
• Take your time reading the lessons carefully.
• Follow the directions and/or instructions in the activities and exercises diligently.
• Answer all the given tests and exercises.
Icons of this Module
What I Need
to Know
This part contains learning objectives that are
set for you to learn as you go along the module.
What I Know
This is an assessment as to your level of
knowledge to the subject matter at hand, meant
specifically to gauge prior related knowledge.
What’s In
This part connects previous lesson with that of
the current one.
What’s New
An introduction of the new lesson through
various activities, before it will be presented to
you.
What Is It
These are discussions of the activities as a way
to deepen your discovery and understanding of
the concept.
What’s More
These are follow-up activities that are intended
for you to practice further in order to master the
competencies.
What I Have
Learned
Activities designed to process what you have
learned from the lesson.
What I Can
Do
These are tasks that are designed to showcase
your skills and knowledge gained, and applied
into real-life concerns and situations.
ii
What I Know (Pre-Test)
Directions: Choose the letter of the best answer. Write the chosen letter on a separate sheet
of paper.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Slash and burn methods of farming are also known as?
A. Kaingin system
C. Tree cutting
B. Logging
D. None of the above
An extensively logged forest would affect
A. the adjacent agricultural areas
C. the sea into which the river flows
in the lowlands
B. the river beside the forest
D. all of the above
Mangrove swamps are useful in a way that they provide
A. construction materials and
C. food for birds
firewood
B. food for many aquatic
D. all of the above
organisms
Peoples’ effect on their environment can be brought about by some of their activities
which includes
A. Logging and extensive
C. Wasteful use of natural resources
kaingin
B. Throwing waste into the
D. All of the above
bodies of water
Which of the following is an example of non-biodegradable materials
A. banana peelings, leaves, seed
C. rice, bread, flour
B. plastic wrapper, rubber, tin
D. None of the above
cans
The following materials are recyclable, except
A. Plastic
C. Paper
B. Can
D. Fruit peelings
Which is a feasible material for house construction
A. Fruit peelings
C. Ashes
B. Plastics
D. Both B and C
An example of good practice to protect the environment is
A. Kaingin
C. Reforestation
B. Over-harvesting
D. Deforestation
The best that you can do to minimize human impact on the environment
A. Recycling and segregating of
C. Organic farming
waste
B. Planting of trees
D. All of the above
Agricultural processes which conserve soil nutrients include
A. Crop rotation
C. Over-cropping
B. Terracing
D. All of the above
iii
Lesson
1
Ways to Minimize Human Impact to
the Environment
What’s In
Activity 1: Fill Me!
Directions: Look at the picture below and identify what you have seen. Write your answer in
your activity notebook.
1. What do you call a substance that pollutes the air, water, or soil?
A. Pollutant
B. Pesticides
C. Acid
2. What are some of the consequences of deforestation?
A. Loss of habitats
B. Soil erosion
C. Both
3. Which of the following animals is endangered?
A. Philippine Eagle
B. Maya bird
C. Cow
4. Global warming will cause an increase of _________.
A. Heat waves
B. Hurricanes
C. Both
5. What is the term for the complete disappearance of species?
A. Termination
B. Disappearance
C. Extinction
6. What do you call the rain that contains many chemicals and is harmful?
A. Smog
B. Acid rain
C. Monsoon
7. Which of these human activities contributes the most for global warming?
A. Using fossil fuels
B. Cutting down trees
C. Both A and B
8. What type of shopping is eco-friendlier?
A. Paper
B. Plastic
C. Neither
9. Which of the following can be recycled?
A. Milk cartons
B. Plastic bottles
C. Both
10. What do you call renewable sources of energy?
A. Alternative energies
B. Bio-energies
C. Solar energies
11. What do you call the processing of used materials and their reuse?
A. Recycling
B. Reusing
C. Reprocessing
12. Which of the following is biodegradable?
A. Plastic
B. Paper
C. Glass
13. Which of Philippine species of animals is NOT in danger of becoming instinct?
A. Mouse deer
B. Horse
C. Philippine deer (Usa)
14. What is the most used renewable energy source in the world?
A. Hydro energy
B. Solar energy
C. Wind energy
1
What I Need to Know
After completing this lesson, you are expected to:

Suggest ways in minimizing human impact to the environment (S8LT-IVj-25)
What’s New
Activity 2: Let’s Find Out
Directions: Find the words or phrases that suggest ways on how you can minimize human
impact to the environment. List the words/phrases that you can find on a 1/2 sheet of paper.
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O
What Is It
Have you answered correctly all the questions in activity 1? Well done! It only shows
that you are aware of the things happening in your surroundings.
Activity 2 brings you to a new dimension wherein you find words or phrases in the
puzzle that suggests ways how you can minimize your impact to the environment
The human population is continually growing, but the Earth’s size remains the same,
resources are consumable and most are non-renewable. Human action may lead somehow
to the destruction of its environment, if not controlled or minimized.
HUMAN ACTIVITIES THAT HAVE IMPACT TO THE ENVIRONMENT
1. Deforestation - is brought about by illegal logging or cutting of trees and Kaingin system
of farming, making the forest denuded resulting in soil erosion, landslide habitat
destruction and loss of wildlife
2. Illegal Mining – mining activity that is undertaken without the permission of the state or
country that may result in landslide and soil erosion.
3. Overfishing – overharvesting of fish, using illegal fishing methods such as the use of
cyanides, dynamite, and fine fishing nets resulting in a shortage of marine food supply.
4. Pollution – anything that makes the environment dirty or substance that changes the
quality of air, water, and land, making it unsafe for humans.
5. Indiscriminate throwing of garbage – improper disposal of waste (throwing of waste
everywhere) which often leads to air, water, and land pollution.
6. Wildlife Destruction – Illegal hunting or poaching, or collecting of wild plants and animals,
that leads to loss of biodiversity.
SOME WAYS TO MINIMIZE HUMAN IMPACT TO THE ENVIRONMENT
1. Reforestation – Planting trees to deforested areas or denuded forests
2. Waste Segregation - Proper waste disposal into designated garbage container like
biodegradable, non-biodegradable and recyclable wastes.
3. Application of 4Rs – REDUCE, REUSE, RECYCLE and REPAIR
4. Organic Farming / Organic Gardening – Using biodegradable wastes as a mean to
fertilize plants.
3
What’s More
Activity 3: Let’s Minimize
Part A.
Directions: Write the things that you can do to protect the environment considering the
following aspects on a one whole sheet of paper. Copy the table below.
REDUCE
I will reduce my
carbon footprint by
riding a bicycle in
going to school
REUSE
RECYCLE
I will reuse my old
notebook
I will recycle plastic
bottles to make a
flower pot
REPAIR
I will repair my old
bag instead of
buying new
Part B.
Directions: Write five things you do at home to be an eco-friendly learner on one whole sheet
of paper. Copy the illustration below.
Eco-Friendly Me
4
What I Have Learned
Activity 4: Human Impact in the Environment… Good or Bad?
Directions: Improve your analytical skills by determining the impacts of specific human activity
or action by writing the positive or negative effects of certain action. Copy the table on a one
whole sheet of paper.
ACTION
1. Tree planting
Good
Impact/Positive
Effects
Bad Impact/ Negative
Effects
Example: Planting
trees helps prevent
soil erosion and global
warming
2. Recycling at Home
3. Waste Segregation
4. Throwing of waste
in the bodies of water
5. Burning plastics,
food wrappers,
Styrofoam and other
garbage
6. Organic Farming
7. Illegal Logging
Example: Illegal logging
may cause destruction of
wildlife habitat and soil
erosion
8. Buying online
products
(Hint: Product
packaging)
9. Kaingin system of
farming
10. Use of dynamite,
cyanide and fine
fishing nets
5
What I Can Do
Activity 5: Tell Me You Can… Tell Me a Story
PART A
Directions: Select one picture and make a story considering the cause, effect and what you
can do to the situation. Write your story on a one whole sheet of paper.
https://www.google.com/url?sa=i&url=https%3A%2F%2F
sloanreview.mit.edu%2Farticle%2Fyes-im-feeling-badabout-climate-change-letsdiscuss%2F&psig=AOvVaw0qkxPqjid2c4ec041426Ej&us
t=1593540851282000&source=images&cd=vfe&ved=0C
AIQjRxqFwoTCNjii7nQpoCFQAAAAAdAAAAABAI(Winston 2019)
https://www.google.com/url?sa=i&url=https%3A%2F%2F
www.vecteezy.com%2Fvector-art%2F299551-scenewith-factory-and-water-pollution
https://www.google.com/url?sa=i&url=https%3A%2F
%2Fwww.istockphoto.com%2Fvector%2Fdeforestati
on-rain-forest-flat-design-gm900111552248357581&psig=AOvVaw3pscz3nC7cBW qGSkmIBxR&ust=1593354042093000&source=imag
es&cd=vfe&ved=0CAIQjRxqFwoTCKiPjciYouoCFQA
AAAAdAAAAABAD
PART B. - I Create….
Directions: Look at your garbage at home. Think about something you can make out of your
garbage. If you have an internet access, you can look into some of the DIY’s (Do it Yourself)
out of garbage.
Sample products:
*Belt out of coffee sachet
*Flower vase from old magazine
*Photo frame out of brochures or drinking straws
*Flower pot or wall decor
Your creativity matters!
“Basura man ako sa inyong paningin, gawin mong kaakitakit at pwedeng mahalin”
6
Summary

Human intervention on nature disrupts ecological balance thereby creating problems
with long term effects that include global warming, climatic changes, and ozone layer
depletion.

Deforestation, mining, urbanization, pollution, depleting natural resources like overharvesting, over collection of wildlife, indiscriminate disposal of waste are some of
the ways that humans had impacted the environment.

Humans as the causative agent of environmental destruction can also be an agent of
change, that is by engaging activities that minimize its impact on the environment.

Reforestation or tree planting, Waste segregation, the use of 4rs-reduce, reuse,
recycle and repair, organic gardening is among the best activities that man can do to
minimize its effect on the environment thereby making the environment restore its
beauty and balance.
7
Assessment (Post-Test)
Direction: For each item encircle the letter of the correct answer.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
Agricultural processes which conserve soil nutrients include
A. Crop rotation
C. Over-cropping
B. Terracing
D. All of the above
The best that you can do to minimize human impact on the environment
A. Recycling and segregating
C. Organic farming
waste
B. Planting trees
D. All of the above
An example of good practice to protect the environment is
A. Kaingin
C. Reforestation
B. Overharvesting
D. Deforestation
Which is a feasible material for house construction
A. Fruit peelings
C. Ashes
B. Plastics
D. Both B and C
The following materials are recyclable, except
A. Plastic
C. Paper
B. Can
D. Fruit peelings
Which of the following is an example of non-biodegradable materials
A. banana peelings, leaves, seed
C. rice, bread, flour
B. plastic wrapper, rubber, tin
D. None of the above
cans
Peoples’ effect on their environment can be brought about by some of their activities
which includes:
A. Logging and extensive kaingin
C. Wasteful use of natural resources
B. throwing waste into the bodies
D. All of the above
of water
Mangrove swamps are useful in a way that they provide
A. construction materials and
C. food for birds
firewood
B. food for many aquatic
D. All of the above
organisms
An extensively logged forest would affect
A. the adjacent agricultural areas
C. the sea into which the river flows
in the lowlands
B. the river beside the forest
D. All of the above
Slash and burn methods of farming are also known as
A. Kaingin system
C. Tree cutting
B. Logging
D. None of the above
8
8.
9.
10.
11.
12.
13.
14.
LESSON 1
Activity 1
1. A
2. C
3. A
4. C
5. C
6. B
7. C
Post-Test
1. D
2. D
3. C
4. D
5. D
6. B
7. D
8. D
9. D
10. A
Pre-Test
1. A
2. D
3. D
4. D
5. B
6. D
7. D
8. C
9. D
10. D
C
C
B
A
B
C
B
9
Activity 3: Answers may vary
Activity 4: Answers may vary
Activity 5: Answers may vary
Activity 2



WASTE SEGREGATION
NO BURNING POLICY
USE ECOBAG




REUSE
REDUCE
RECYCLE
REPAIR




WALKING
TREE PLANTING
ORGANIC FARMING
REFORESTATION
Key to Answers
References
Andrew Winston. 2020. Yes, I'm feeling Bad about Climate Change. Let's Discuss. [online]
Available at: <https://www.google.com/.mit.edu%2Farticle%2Fyes-im-feeling-bad-aboutclimate-change-lets-discuss />; [Accessed 30 June 2020]
Jayce Hillington. 2020. Environment Quiz. [online] Available at:
<https://en.islcollective.com/english-esl-worksheets/vocabulary/environment/environmentquiz/21980./>; [Accessed 27 June 2020]
Pia C. Ocampo; May R. Chavez; Maria Helen D. Catalan. 2013. Science learner Module.
Department of Education, pp. 272.
Rabago PhD, Lillia M., Cresencia, C. Joaquin Phd, and Catherine B Lagunzad Phd. 1997.
Science and Technology Biology. Department of Education, pp. 6-27.
10
For inquiries and feedback, please write or call:
Department of Education – Bureau of Learning Resources (DepEd-BLR)
Department of Education – Division of Gingoog City
Office Address:
Brgy. 23, National Highway,Gingoog City
Telefax:
088 328 0108/ 088 328 0118
E-mail Address:
gingoog.city@deped.gov.ph