Overview

AB PAT Grade 9 Science

Biological Diversity

1. Niches Populations and Symbiotic Relationships

1.1 Introduction, System Dynamics, Complex interactions

Ecosystems Uncovered: System Dynamics and Complex Interactions

Discover how living organisms and nonliving forces interact to create dynamic, self-regulating ecosystems through energy flow, feedback loops, and species relationships.

What You'll Learn

Ecosystems include biotic and abiotic components interacting dynamically together.

Trophic cascades and feedback loops regulate ecosystem stability over time.

Keystone species and biodiversity are essential for maintaining ecosystem resilience.

Ecological succession describes community recovery following environmental disturbances.

What You'll Practice

Students identify ecological relationships including mutualism, parasitism, and commensalism.

Learners analyze trophic cascades, feedback loops, and keystone species scenarios.

Questions test understanding of succession, carrying capacity, and eutrophication effects.

Why This Matters

Understanding ecosystem dynamics equips students to analyze real-world environmental challenges and make informed decisions about conservation, sustainability, and the interconnected natural world.

This Unit Includes

Practice exercises

Learning resources

Skills

Ecosystem Dynamics

Trophic Cascades

Feedback Loops

Biodiversity

Ecological Succession

PROVINCE-TESTS Curriculum Aligned