The picture below shows a pond ecosystem. Use this picture and what you know about the things in it to answer the questions in this section.
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1 The picture below shows a pond ecosystem. Use this picture and what you know about the things in it to answer the questions in this section. 1. Which animal is the top carnivore in the pond system? Explain why you chose this answer.
2 Question 1 Scoring Guide Score & Description Complete Student response demonstrates understanding of which animal is the top carnivore by choosing the heron and explaining that the heron is at the top of the food chain. Partial Student response chooses the top carnivore, the heron, but provides no explanation, or an incorrect or incomplete explanation for choosing the heron. Alternatively, student responses may define what a top carnivore is, but name an incorrect organism or state a reasonable top carnivore such as a fish. Unsatisfactory/Incorrect Student response may name an organism that is not a top carnivore (e.g., plant, frog), and demonstrates no understanding of the concept of top carnivore. Complete - Student Response Response names the heron as the top carnivore, and provides several examples that show understanding of the heron being at the top of the food chain.
3 Response indirectly names the heron as the top carnivore, and shows understanding that the heron is at the top of the food chain by stating that the heron has no predators in the ecosystem. Partial - Student Response Response names the heron as the top carnivore, but provides an incomplete explanation of the heron's position at the top of the food chain by referring only to the fact that the heron can eat the other organisms. Response names the heron as the top carnivore, but provides an incorrect explanation. Unsatisfactory/Incorrect - Student Response Response names a carnivore, the large fish, but does not demonstrate any understanding of the large fish being near the top of the food chain.
4 Response demonstrates no understanding of the top carnivore by naming an organism at the bottom of the food chain.
5 Score 2000 National Performance Results Unsatisfactory/incorrect 18% Partial 62% Complete 16% Omitted 2% Off task 0% Percentage of Students Note: These results are for public and nonpublic school students. Percentages may not add to 100 due to rounding. The Fields of Science: Life Sciences (Sub content classification: Ecology) Knowing and Doing Science : Conceptual Understanding The Fields of Science Life Sciences This question measures basic knowledge and understanding of the following: Knowing and Doing Science Conceptual Understanding Conceptual understanding includes the body of scientific knowledge that students draw upon when conducting a scientific investigation or engaging in practical reasoning. Essential scientific concepts involve a variety of information, including facts and events the student learns from both science instruction and experiences with natural environment; and scientific concepts, principles, laws, and theories that scientists use to explain and predict observations of the natural world.
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