33. Most of the food for the aquatic ecosystem is produced by _________. A. worms B. phytoplankton C. fish D. shellfish
34. What kind of system formed by the interaction of a community of organisms with their environment? A. ecosystem B. intertidal zone C. estuaries D. marine animals
35. What type of consumer feeds directly on a producer? A. carnivore C. second order consumer B. first order consumer D. third order consumer
36. Food chains and food webs are models that shows different relationships within an ecosystem. The primary difference between a food chain and a food web is that ____________. A. a food web shows how energy is used C. a food web is a complex system of food chain B. a food chain shows how energy is stored D. a food chain is a complex system of food chains
37. Why is it advantageous to burrow oneself into the sand if you live in an intertidal zone? A. So you would not be carried away by the tide B. So you can make a bigger home C. So you can get more oxygen D. So you can get food
38. The following statements show the protection and conservation of the estuaries and intertidal environment except _______. A. Proper disposal of garbage and household chemicals B. No to dynamite fish C. Overharvest of recreational and commercial species D. Planting marsh grass
39. Why is it important to protect the estuaries and intertidal environment? A. It provides places for habitat of valuable species of plants and animals. B. It attracts tourists. C. It gives people work to do. D. It is a mandate to give importance from the town mayor.
40. As a grade five pupil, how can you contribute in the preservation and conservation of our estuaries? A. Join in a stream or beach cleanup in our community or in school. B. Advise your town mayor to conduct an orientation. C. Do not use pesticides. D. Keep more fishes alive.
