1. An estuary is another kind of habitat. Which of the following describes an estuary?


A. Land area that drains water into a lake, river, or pond.

B. Underground system that provides drinking water to an area.

C Large body of saltwater that covers most of the Earth’s surface.

D. Area where a river meets the ocean, where in mixing of freshwater and saltwater happens.


2. Philippines is rich in coastal areas which are affected by the rising and receding tides. What part of the land constantly exposed to the changing tides?


A. Estuary

B. Intertidal zone

C. Lagoon

D. Lake


3. Producers are green plants or microorganisms that are capable of making their own food. Which of the following organisms start the food chain?


A. Shrimp

B. Salmon

C. Green algae

D. Heron


4. Living things in an ecosystem consist of the producers, consumers, and decomposers. Why does a food chain always begin with producers?


A. they are plants

B. they are animals

C. they are consumers

D. producers can make their own food


5. If planktons are removed from the intertidal zones, what may happen to the intertidal zone food web?


A. Planktons are producers so their removal may not have an effect.

B. The other animals in the intertidal zone will have to find other food sources.

C. Removal of any organisms like the plankton will greatly affect the ecosystem.

D. Filter feeders like oysters and clams don’t depend on the presence of plankton.


6. Areas where seawater meet the freshwater from the rivers is also a home to various kinds of animals. These areas are called estuaries. What services do estuaries provide?


A. It provides area that is above water level at low tides and underwater at high tide

B. It provides an active area of research because the communities are often well defined and the common organisms.

C. It provides vital nesting, breeding and feeding habitats for many species.

D. It provides sediments in which organisms bury themselves


7. Why we need to leave our beaches clean after our picnic?


A. Trash can harm the habitats in the ocean.

B. Trash can attract tourist.

C. Trash can make our estuaries beautiful to look at.

D. Trash can protect the fishes in the ocean.


8. Birds, fishes and mussels are found in the estuaries, Why is there a need to protect and conserve them?


A. improve environmental projects

B. have a place for recreation

C. attract tourists and earned more money

D. maintain the health of coastal fisheries and waters


9. An estuary is a partially enclosed, coastal body where freshwater from rivers and streams mixes with salt water from the ocean. Why do we need to protect our estuaries?


A. Many different habitat types are found in and around estuaries

B. It staves off erosion caused by storms

C. Feeding spot for both resident and migrating birds

D. It provides more favorable conditions for those organisms that cannot tolerate air exposure for long


10. Intertidal zone is also susceptible to pollution and trash. How can we protect it?


A. Disturb the animals that you found along the shoreline

B. Collect any trash you see along the shoreline

C. Use chemical base household products

D. Dispose toxic products into the river​