APES 2026 Midterm 25 Multiple Choice Questions – Ecosystems Energy Flow Cycles Biodiversity Answers, Environmental Science

This document contains a structured set of approximately 25 multiple-choice questions with verified answers for the AP Environmental Science (APES) midterm exam. It covers essential topics including ecosystem structure, energy flow, biogeochemical cycles (nitrogen and phosphorus), hydrologic processes, and ecological resilience. The questions are presented in a clear exam-style format, making it an effective tool for testing knowledge and reinforcing key environmental science concepts. The material provides comprehensive coverage of fundamental ecological principles such as trophic levels, nutrient cycling, transpiration, runoff, leaching, and factors influencing biodiversity and ecosystem stability. As shown across pages 2 to 9, the document emphasizes applied understanding through scenario-based and conceptual questions, helping students build both recall and analytical skills required for midterm assessments. It also highlights critical environmental issues such as algal blooms and hypoxic conditions, linking theory to real-world ecological impacts. This resource is highly suitable for high school students enrolled in AP Environmental Science (APES), as well as introductory-level university students studying Environmental Science, Ecology, Sustainability, or Earth Science. It is particularly useful for students preparing for midterms, quizzes, or practice exams, and for those seeking to strengthen their understanding of ecosystem interactions and environmental processes. The content aligns closely with standard AP Environmental Science textbooks, particularly Living in the Environment by G. Tyler Miller and Scott Spoolman, as well as other introductory environmental science texts commonly used in AP and early undergraduate courses. It can be effectively used alongside class notes, lectures, and review materials to enhance exam performance and conceptual clarity. Keywords: APES, environmental science exam, ecosystem, energy flow, trophic levels, hydrologic cycle, transpiration, runoff, nitrogen cycle, phosphorus cycle, biodiversity, ecological resilience, algal bloom, hypoxia, leaching, atmosphere composition