II. Encircle the letter of the best answer.

11. Which group of organism can be found in the mangrove ecosystem?

A. mussels, fish, corals.

B.worm, rat, fish

C. butterfly, snake, bird.

D. mangrove trees, fiddler crab, fish.

12. What are the things needed by plants to make their own food?

A. water, chemical, oxygen

C. oxygen and chemical

B. oxygen and carbon dioxide

D. carbon dioxide, soil and sunlight

13. What kind of interaction is shown when one organism kills another organism for food?

A. mutualism

B. commensalism

C. parasitism

D. predation

14. One example of competition in tropical rainforest is when the shrubs and trees are growing together in one area. What do they compete for?

A. Sunlight and soil nutrients

C. oxygen and carbon dioxide

B. chemical and oxygen

D. water and chemicals

15. It is an environment where both living and non-living things exist and interact with one another.

A. ecology

C. community

B. ecosystem

D. population
16. Which of the following destroy coral reefs?

A. mangrove planting

C. waste dumping

B. building man-made fish
sanctuaries

D. coastal clean up

17. which of the following strategies show how to conserve the balance of life in the ecosystem?

A. massive cutting of trees

C. destroying wildlife ecosystem

B. conserving the needs of the living things

D. dumping garbage anywhere

18. Which of the following show wildlife conservation?
A. excessive hunting of wildlife animals

B.protecting the forests against harmful activities

C. practicing kaingin system in the forest

D. muro-ami fishing

19. Why is dynamite fishing prohibited?

A. The use of explosives contributes food to marine animals.

B. The use of explosives benefits to plants and animals.

C. The use of explosives improves marine sanctuary.

D. The use of explosives destroys the marine life.

20. Here are some ways of protecting and conserving wildlife, which one is not?

A. Buy products made from animal parts.

B. Protect a fish sanctuary

C. Support program for wildlife conservation​