ENVS 1126 – 30 Exam Questions on Biogeochemical Cycles, Population Growth & Ecology – Louisiana State University

This document features a complete set of 30 exam questions and correct answers from Week 3 of ENVS 1126 (Environmental Science), covering key topics essential for mastering introductory environmental science. The material focuses on biogeochemical cycles such as the nitrogen and phosphorus cycles, detailing their chemical processes, environmental impacts, and real-world significance. Students will find concise explanations of the food chain, biomass production, respiration, and nutrient flow through ecosystems. The questions also explore population dynamics, including exponential and logistic growth, carrying capacity, and related equations. Ecological principles like keystone species, invasive species, inter- and intraspecific competition, resource partitioning, and character displacement are addressed with clarity. Notable case studies include predator-prey dynamics (wolves and moose), and anthropogenic impacts such as lead poisoning in California condors. Additional concepts such as continental drift, weathering, acclimation vs. adaptation, and nitrogen fixation in legumes are covered, making this a well-rounded study resource. This material is highly beneficial for: – Undergraduate students in environmental science, biology, ecology, natural resource management, or earth sciences – Students preparing for exams in introductory science courses – Learners looking for applied understanding of ecosystem processes and environmental interactions Keywords: environmental science, ENVS 1126, exam questions, nitrogen cycle, phosphorus cycle, biogeochemical cycles, food chain, respiration, population growth, exponential growth, logistic growth, carrying capacity, keystone species, invasive species, adaptation, acclimation, competition, resource partitioning, continental drift, weathering, moose wolf dynamics, California condor, nitrogen fixation, legumes, denitrification, anammox, ecology, nutrient cycling