Biodiversity indices and community stability are the focus of this Grade 7 Ontario Science resource on interactions in the environment. Students examine species richness, evenness, habitat heterogeneity, niche diversity, species turnover, and the limits of using a single biodiversity metric to describe community structure.

Read, Interpret, Compare

The reading passage builds a clear foundation for interpreting biodiversity measurements. Students distinguish species richness, which describes the number of species present, from evenness, which considers how individuals are distributed among species. They also explore why combined biodiversity indices can provide useful comparisons between contrasting habitats while still requiring careful interpretation.

Students connect these measures to ecological stability by considering how communities with greater diversity may respond differently when environmental conditions change. The resource also introduces habitat heterogeneity and niche diversity, showing how varied microenvironments can support more niches and contribute to species turnover across space.

Concepts and Question Types

The student practice moves from definitions and interpretation toward ecological reasoning. Students work with multiple-choice questions, true-or-false questions, short-answer responses, a matching activity, a cloze passage, an extended response, and a Did You Know section.

Questions ask students to distinguish richness from evenness, interpret communities with rare and common species, compare habitats with different abundance patterns, explain possible links between diversity and stability, connect habitat heterogeneity with niche diversity, and identify why a single metric can be misleading.

What the Teacher Receives

• ✔️ Student worksheet focused on biodiversity indices and community stability
• ✔️ Separate answer key PDF for checking student work
• ✔️ Student Notes & Lesson Summary supplement for reinforcing key concepts
• ✔️ Teacher Guide with Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes

Use It for Ecological Reasoning

This Grade 7 science worksheet can be used during instruction on interactions in the environment, as guided practice after teaching biodiversity concepts, or as an assessment opportunity. The extended response asks students to compare hypothetical habitats with different richness and evenness and explain why diversity comparisons may require more than one measure.

The combination of conceptual reading, vocabulary connections, interpretation, and written explanation gives students repeated opportunities to reason about community structure without reducing biodiversity to a single number. Teacher support materials provide practical guidance for reinforcing the concepts and addressing common mistakes.