1. Direction: Read each statement carefully. Choose the letter of the correct answer by writing it on the blank before the number 1. What kind of ecosystem where freshwater meets o saltwater? A. habitat C. estuaries B.intertidal zone D. marine zoo -2. It is an ecosystem where the ocean floor is covered and uncovered as the tide goes in and out. A. terrestrial Zoo C. habitat B. estuaries D. intertidal zone _3. Is fresh water suitable to all kinds of plants? Why? A. No, because plants may die due to the absence of salt in the water. B. Yes, some marine plants can be grown in fresh water. C. Not all. Some plants can survive in fresh water while others like marine plants can only survive in salt water. D. It depends on the kind of plant and fertilizers used by the farmer. 4. Why is the ocean floor covered and uncovered as the tide goes in and out? A. It is affected by the current of water during daytime and night time. B. Because of the regular movement of the animals under the sea. C. It is caused by the dynamite explosion. D. Due to the occurrence of natural calamities in the country. 5. The following pictures are examples of a food chain or a food web. Which picture describes a food chain in estuaries? se C. D. B. 6. Most of the food for the aquatic ecosystem is produced by A woms B. phytoplankton C. fish D. shellfish 7. What kind of system formed by the interaction of a community of organisms with their environments A. ecosystem B. intertidal zone C. estuaries D. marine animals 8 What type of consumer feeds directly on a producer? A. carnivore C. second-order consumer B. first-order consumer D. third-order consumer 9. 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 B. a food web is a complex system of food chain C. a lood chain shows how energy is stored D. a food chain is a complex system of food chains
