Read each question carefully. Write the letter of the correct answer on the blank.
_____ 1. Which layer of the tropical rainforest is the highest?
a. Canopy c. forest floor
b. Emergent layer d. understory
_____ 2. What type of coral reefs are found near the shore?
a. Atolls c. barrier reefs
b. Fringing reefs d. great reefs
_____ 3. Organisms that consume only producers are known as ________.
a. Herbivores c. carnivores
b. Omnivores d. prey
_____ 4. Organisms that can either consume producers and consumers are known as
________.
a. Herbivores c. carnivores
b. Omnivores d. prey _____ 5. Organisms in an ecosystem can be classified as producer or consumer. The
producers provide food for the consumers. An organism that consumes producers
and consumers is called ________.
a. Herbivores c. carnivores
b. Omnivores d. prey
_____ 6. Decomposers are known as the clean-up crew. Scavengers also get rid of the
waste in an ecosystem. Scavengers differ from decomposers because they
________.
a. Do not kill organisms for food c. do not eat dead organisms
b. Break down larger organisms d. only feed on living plants and
animals

_____ 7. Why is the forest floor damp and dark?
a. The forest floor receives very little sunlight
b. Thick vegetation makes it difficult for water to evaporate
c. The high humidity and rainfall in the forest make it constantly wet
d. All of the above
_____ 8. How do mangrove forests filter silt, dirt, and sand from the rivers?
a. The healthy leaves of the mangroves block the particles
b. The thick bark of mangroves blocks the particles from land
c. The numerous siltlike roots of mangroves serve as a filter for these particles
d. The decayed, fallen leaves of mangroves block the sediments from reaching the
sea

_____ 9. Why do migratory birds roost on mangrove swamps?
a. Mangrove swamps offer freshwater for migrating birds
b. Migratory birds need to avoid the hot summer in their native habitat
c. Mangrove swamps are rich in potential food sources for migrating birds
d. None of the above
_____ 10. How do coral reefs help in promoting our country’s tourism status?
a. Coral reefs provide more foods for the tourists
b. Coral reefs make the beaches and the sea clean
c. Coral reefs provide aesthetic pleasure to tourists
d. Corals produce reef that can be harvested as decoration in houses