Biodiversity and ecosystem resilience are central to understanding how ecological communities withstand disturbance, recover, and remain viable over time. This Grade 12 Environmental Science worksheet explores how species richness, functional diversity, trophic structure, and population regulation contribute to ecosystem stability.

Explore what keeps ecosystems in balance

Students examine how ecological roles and relationships support ecosystem processes, then consider what happens when those relationships change. The reading passage introduces key vocabulary and connects biodiversity with real ecological questions, including how ecosystems respond to disturbance and when changes may become difficult to reverse.

• Species richness and functional diversity: distinguish the number of species from the variety of ecological roles they perform.
• Trophic structure: describe feeding relationships among producers, consumers, and decomposers.
• Population regulation and carrying capacity: explain how resources, competition, and predation influence population size and ecosystem balance.
• Resistance, recovery, and succession: compare an ecosystem’s ability to withstand disturbance with its return toward previous conditions.
• Ecological pressures: evaluate how invasive species and habitat fragmentation can affect biodiversity and long-term viability.
• Thresholds and ecosystem services: interpret tipping points and consider how functioning ecological processes support services such as water purification, soil formation, and pollination.

Apply the concepts in different ways

This biodiversity and ecosystem stability resource combines a reading passage with multiple-choice questions, true-or-false statements, short-answer responses, a labeled diagram, a categorizing activity, and a short note. Students move from identifying ecological terms to explaining relationships and evaluating how disturbances may affect an ecosystem.

The short-answer prompts ask students to explain how functional diversity can maintain ecological processes, distinguish resistance from recovery, and describe how habitat fragmentation can affect biodiversity. These tasks give students opportunities to express ecological reasoning in their own words rather than relying only on recognition.

Ready for classroom use

• Printable student worksheet: includes Student Notes lines at the bottom for recording key ideas.
• Separate answer key PDF: provides answers for checking student work.
• Teacher Guide: included in the Answer Key PDF, with Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes.

Use this Grade 12 environmental science practice during a biodiversity or ecosystem dynamics lesson, for independent classwork, review, or a check of students’ understanding after instruction. The included answer key supports convenient checking, while the Teacher Guide offers additional instructional support.

Written for the provided TEKS reference SCI.12.13, this worksheet gives students a focused opportunity to connect biodiversity, ecosystem resilience, disturbance, and ecological viability.