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_____8. Which performs blood clotting when a person is injured?
A. WBC
B. RBC
C. Plasma
D. Platelet

_____9. What kind of blood flows from the heart to the lungs?
A. oxygen-rich or oxygenated blood
B. oxygen- poor or deoxygenated blood
C. blood which contains nutrients and waste materials
D. both A and B

_____10. Which of the following organs make up the Central Nervous System?
A. muscles and bones
B. brain and spinal cord
C. interneurons and motor neurons
D. sensory neurons and motor neurons

_____11. Which of the following vertebrates does not belong to the group?
A. sea lion
B. penguin
C. seal
D. whale

_____ 12. The following practices contribute to the dwindling population of vertebrates EXCEPT_______.
A. Illegal hunting
B. Habitat destruction
C. Trading of native species
D. Designation of wildlife sanctuaries

_____13. Why do some mollusks have shells?
A. So they can live both on land and water.
B. To make it easier to find food.
C. To maintain their body temperature
D. To protect their soft bodies.

_____14. Which of these groups of animals belong to echinoderms?
A. bees, butterfly and mantis
B. sand dollar, starfish and sea urchins
C. earthworm, leeches and tapeworm
D. spider, ticks and scorpion

_____15. Which group of invertebrates is divided into segments with a ringed appearance?
A. sponges
B. echinoderms
C. cnidarians
D. annelids

_____16. Animals such as vertebrates and invertebrates have economic importance. They are sources of food, medicine and scientific investigations. How will you show that you care and protect these animals in their environment?
A. We don’t need to strictly implement wildlife regulations.
B. We must have them lived in our houses.
C. We have to establish reserve wildlife refuge areas where birds and animals may breed without being killed by man.
D. Hunting activities must be practiced

_____17. What kind of interaction is shown when one organism kills another organism for food?
A. mutualism
B. commensalism
C. parasitism
D. predation

_____18. 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.
B. oxygen and carbon dioxide.
C. chemicals and oxygen.
D. water and chemicals

_____19. Why is the relationship between the corals and the algae in the coral reefs considered mutualistic?
A. The corals benefit in the interaction and not the algae.
B. The corals receive oxygen from algae, the algae get protection from corals.
C. The corals receive oxygen from algae while the algae are harmed.
D. The corals and algae live together without harming each other.

_____20. Which group of organisms 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

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