HSA Biology Public Release 2005 - mdk12

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Session 1 22 BCR A population of sea urchins in a kelp forest ecosystem is being overfished. A team of students believe that a decline in the number of sea urchins will affect the organisms in the kelp forest ecosystem. The kelp forest food web below shows the relationships among the organisms in the kelp forest ecosystem. KELP FOREST FOOD WEB Northern Elephant Seals Horn Sharks Sea Otters Sea Urchins Kelp Kelp Crab The students believe that the kelp crab population will decrease if the sea urchin population decreases. Use the kelp forest food web to support or refute the students’ conclusion. In your response, be sure to • describe the roles of the kelp crab, sea otter, and sea urchin in the food web • describe the relationships between the kelp crab, sea otter, and sea urchin • explain how each organism in the food web would be affected by a change in the sea urchin population Write your answer in your Answer Book. Biology Public Release 2005 Page 16 Copyright © 2005 by Maryland State Department of Education.
Session 1 D irections Use the information and the food chain below to answer Numbers 23 and 24. Cholera bacteria live inside copepods, tiny marine organisms. This type of microscopic bacteria harms the copepods by feeding off their internal tissues. Both of these organisms are found in oceans throughout the world. Unfavorable temperatures or salt levels may cause cholera bacteria to become inactive. When inactive, they do not feed or reproduce. When conditions become favorable, they become active once again. A cholera population may depend on the population of copepods in the surrounding water. A simple food chain showing this relationship is shown below. MARINE FOOD CHAIN Cholera bacteria Copepods Microscopic algae ■23 Cholera bacteria perform binary fission to A B C D reproduce asexually digest food rapidly regulate temperature increase body size ■24 Which of these describes the relationship between cholera bacteria and copepods? F G H J mutualism parasite–host commensalism producer–consumer Biology Public Release 2005 Page 17 Copyright © 2005 by Maryland State Department of Education.
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Page 33 and 34: Session 2 ■42 Coyotes and gray wo
Page 35 and 36: Session 2 48 BCR Mammals are expose
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HSA Biology Public Release 2005 - mdk12

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