3. In the forest ecosystem, which organisms are directly affected if the population of plants decrease?
A. carnivores B. decomposer C. herbivores D. predators
4. It is a distinct ecological community of plants and animals living together in a climate.
A. abiotic B. biotic C. ecosystem D. population
5. In a coral reef ecosystem, clown fishes and sea anemones live together. What type of relationship do they have?
A. commensalism B. mutualism C. parasitism D. predation
6. What are the producers in the coral reef ecosystem?
A. algae B. Sea anemones C. mangrove D. small fish
7. It serves as a breeding ground for marine life. This is where you can find seagrass beds that have a diversity of organisms such as stone crabs, lobsters, and snappers.
A. coral reefs B. rainforests C. mangroves D. freshwater
8. Where do mangrove swamps located?
A. in arctic coastlines C. along temperate coastlines
B. along rocky coastlines D. beside tropical and subtropical coastlines
9. Which is considered as the resident species in the mangrove swamp ecosystems?
A. fish B. egret C. oysters D. monitor lizard
10. Why do mangrove plants survive in brackish water while the other plants cannot?
A. Mangroves have strong trunk and roots. C. Mangroves have roots that are often exposed to above water.
B. They can adapt to filter the seawater. D. They have roots that can filter saltwater and excrete salt in their leaves.
11. Why most of the sunlight does not penetrate to the ground in tropical rainforest?
A. It is because of rainfall. C. It is because of less temperature.
B. It is because of less rainfall D. It is because of trees overlap with each other
12. Which food chain does occur in the forest ecosystem?
A. grass caterpillar  chicken C. corn  mouse  snake
B. berries  flower pecker  Philippine cobra D. worm berries  caterpillar  raven
13. Ana will go to the forest. What are the living things she can find there?
A. cow, grass, mouse, soil C. trees, fern, snail, mushroom
B. farmer, carabao, rat, trees D. horse, goat, cow, water
14. Which of the following characterizes a tropical rainforest ecosystem?
I. It is in the polar zones.
II. It has diverse plant and animal species
III. It is situated in tropical places.
IV. It caters to a few plants and animals.
A. I and II B. II and III C. I and III D. III and IV
15. In the coral reef ecosystem, clown fishes, and sea anemones live together. Which type of relationship is shown?
A. commensalism B. mutualism C. parasitism D. predation