SCIENCE 5

2nd QUARTER
Module 6

Estuaries and
Intertidal Zones

Most Essential Learning Competencies

⚫ Discuss the interactions among living things and non-living things in
estuaries and intertidal zones. (S5LT-llh-8)

To the Learner
This module was specially designed to help you understand and
apply the lesson objectives. Read and follow the simple instructions as
your guide.
1. Set a conducive learning space at home so you can focus.
2. Seek assistance from your parents or guardian to guide you in
doing the activities.
3. Take down important concepts and list questions you would like
to ask from your teacher.
4. Reflect and apply the concepts learned.
Expectations

At the end of the lesson, the learner is expected to:

1. recall the different interactions among living and non-living things.

2. differentiate biotic (living) and abiotic non-living things; and

3. describe the living and nonliving things interactions in estuaries and intertidal zones.

It is crucial that the set of activities will arouse their critical thinking skills.

Remember that the KEY for understanding this module is by guiding your children.

Directions: Read the questions carefully. Write the letter of the correct answer on

the blank before the number.

____1. It is called the nurseries of the sea.

A. estuary B. abiotic C. biotic D. intertidal

____2. When a river meets the sea, the two main properties of water that are affected

are?

A. salinity and pH B. salinity and temperature C. temperature and pH D. none

____3. What is an area where land meets the sea, between high and low tide zones?

A. abiotic B. estuary C. intertidal zone D. biotic

____4. Which of these abiotic factors refers to the amount of salt in water?

A. brackish water B. salinity C. temperature D. waves

____5. What is form when freshwater mixes with saltwater?

A. brackish water B. salinity C. temperature D. waves

Unscramble the word/s to form a new word. Then write the correct word/s on the

space provided.

______________1. T I O N P O LL I N A

______________2. L I P S T I

2
______________3. M I N A R E G N O T I

______________4. R A N T H E

______________5. P A G A N P O O R T I

An estuary (nurseries of the seas) is a body of brackish water near the coast

where fresh water from rivers and streams flows into the oceans and mixes with salt

water. It may be a bay, a lagoon, or a harbor. Abiotic (non-living) and biotic (living) are

factors that affects an ecosystem. The intertidal zone is an area where land meets the

sea, between high and low tide zones.

Intertidal zone and estuary are composed of all plants, animals, and

microorganisms living in it. These includes; coral reefs teaming with many corals with

different kinds of fishes, jellyfishes etc. in it, salt marsh are areas which are filled with

sea water during high tide and becomes drained during low tide with clams, oysters etc.,

in it, mud flats are areas with large amount of mud deposited on it with crabs, migratory

birds etc. in it, and rocky shore which has many rocks deposited with barnacles hermit

crabs etc. in it.

COMPLETE ME!

Objective: Identify the biotic factors in an intertidal zone and estuarine ecosystem.

Material: ballpen and notebook

Procedure:

1. Tabulate the different habitats found in an intertidal zone and estuary.

2. Choose from the phrases below to complete the table.

 HABITAT DESCRIPTION ANIMALS LIVING IN IT

CORAL REEF

MUD FLATS

SALT MARSH

ROCKY SHORE

• These are areas which are filled with sea water during high tide and
becomes drained when low tide.
• These are the shore which has many rocks deposited that serve as
hiding place for the small crabs and prawns.
• Areas which has a large amount of mud deposited on it.
• Areas which are teeming with many corals. This serve as a sanctuary
for young fishes.
• barnacles, hermit crab, sea stars, limpets, mollusks, shrimps, prawns
and crabs
• corals, different kind of fishes, jellyfishes, sea anemones and sea star
• clams’ oysters, mussels, snails and shrimps
• crabs, migratory birds, sand dollars, mussels, clams, mollusks, and
shellfish

I HOPE YOU COMPREHEND!

Objective: Describe the living and nonliving things interactions in estuaries and

intertidal zones.

Material: ballpen and notebook

4
Procedure:

1. Read the paragraph carefully, note the important details.

2. Answer the following guide questions below.

Our Earth is a big ecosystem with living and non-living factors in it.
Light from the sun is the most important thing in an ecosystem. Producers,
consumers and decomposers are the living things in any ecosystem. Energy
and nutrients are transferred from the producers to decomposers in a
feeding relationship.
Producers are green plants that can produce their own food. They
make their own food by converting energy from the sun into chemical
energy.
Consumers get their energy from plants and other organisms.
Animals and people are consumers. Organisms that eat plant only are called
herbivores and known as primary consumers. Living things that eat other
animals are known as carnivores. Carnivores that eat herbivores are called
secondary consumers but if they feed on other carnivores they are
considered as tertiary consumers. There are organisms that eat both
plants and animals and are called omnivores.
Decomposers get their energy by breaking down dead things and
their wastes, returning the nutrients from the environment. Food chain on
the other hand is a series of organisms that feed on another organism and
so on. Food web is consisting of two or more food chains.
.
Guide Questions:

1. What are the two feeding relationships in an intertidal zone or estuarine ecosystem?

___________________________________________________________________

2. What are the three biotic (living) factors in any ecosystem?

________________________________________________________________

3. What will happen to the other living things if producers are removed from their

environment? ______________________________________________________

Remember

➢ Estuaries is the boundary where a freshwater ecosystem meets a saltwater

ecosystem, it also serves as the breeding ground of many ocean fish.

 ➢ Intertidal Zone is the shallowest part of the ocean ecosystem, where the ocean is

covered and uncovered as the tide goes in and out. It is the habitat to organisms

of seaweeds sea anemones, crabs, etc.

➢ Estuaries are unique ecosystems that are part salt water and part freshwater. Like

intertidal zones, estuaries change with the tides. When the tides come in, estuary

water becomes saltier. When the tide runs out, estuary becomes mostly freshwater

and waste are flushed out.

Check Your Understanding

Identification.

_____1. An ecosystem where a freshwater meets a saltwater?

_____2. A kind of ecosystem where the ocean is covered and uncovered as the tide

goes in and out?

_____3. A kind of system formed by the interaction of a community of organisms with

their environment.

_____4. A relationship that shows how each living thing gets its food?

_____5. A relationship which shows the organisms that eat and get eaten in an

environment?

Posttest
Directions: Read the questions carefully. Write the letter of the correct answer on

the blank before the number.

____1. Which of these abiotic factors refers to the amount of salt in water?

A. brackish water B. salinity C. temperature D. waves

____2. It is called the nurseries of the sea.

A. estuary B. abiotic C. biotic D. intertidal

____3. When a river meets the sea, the two main properties of water that are affected

are?

A. salinity and pH B. salinity and temperature C. temperature and pH D. none

____4. What is the form when freshwater mixes with saltwater?

A. brackish water B. salinity C. temperature D. waves

____5. What is an area where land meets the sea, between high and low tide zones?

A. abiotic B. estuary C. intertidal zone D. biotic

Reflection
Estuaries and Intertidal Zone

Directions: Write a reflective learning on what you learned from the lesson by answering

the questions inside the computer. You may express your answer in a more creative

presentation of your amazing learning. Have fun and enjoy!

Estuaries and Intertidal zones

guide me to ponder on…

What learnings have I found in

this lesson…

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 ANSWER SHEET
SCIENCE 5
QUARTER 2 WEEK 6

PRE-TEST
1.
2.
3.
4.
5.
LOOKING BACK
1.
2.
3.
4.
5.
CHECK YOUR UNDERSTANDING
1.
2.
3.
4.
5.
POST-TEST
1.
2.
3.
4.
5.